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七年级数学试题库

七年级数学试题库

七年级数学试题库一、选择题1.陆地上最高处是珠穆朗玛峰顶,高出海平面8844m,记为+8844m;陆地上最低处是地处亚洲西部的死海,低于海平面约415m,记为()。

A. +415mB. -415mC. ±415mD. -8848m答案:B2.在-4,0,-1,3这四个数中,最大的数是()。

A. -4B. 0C. -1D. 3答案:D3.下列语句正确的是()。

A. 在所有联结两点的线中,直线最短B. 线段AB是点A与点B的距离C. 三条直线两两相交,必定有三个交点D. 在同一平面内,两条不重合的直线,不平行必相交答案:D4.已知线段AB和点P,如果PA+PB=AB,那么()。

A. 点P为AB中点B. 点P在线段AB上C. 点P在线段AB外D. 点P在线段AB的延长线上答案:B5.一个多项式减去x2等于x2,则这个多项式是()。

A. -2x2B. x2C. 2x2D. -x2答案:C二、填空题1.在数轴上点A表示数1,点B与点A相距3个单位,点B表示的数是______。

答案:-2或42.已知|3m-12|+n^2=0,则2m-n=______。

答案:9(提示:由|3m-12|+n2=0,解得m=4,n=0)3.观察下面的一列单项式:2x,-4x^2,8x^3,-16x^4,…根据你发现的规律,第7个单项式为______;第n个单项式为______。

答案:-128x(n+1)×2n4.据科学家估计,地球年龄大约是4600000000年,这个数用科学记数法表示为______。

答案:4.6×10^9三、计算题1.计算:(-3)-[-5-(1-0.24-3/5)-(-2)]。

答案:5(提示:按照运算顺序,先算括号内的,再算括号外的)2.当a=2时,代数式5a-1的值是______。

答案:9(提示:将a=2代入代数式5a-1中计算)四、解答题1.某登山队5名队员以二号高地为基地开始向海拔距二号高地500米的顶峰冲击,设他们向上走为正,行程记录如下(单位:米):+150,-32,-43,+205,-30,+25,-20,-5,+30,+75,-25,+90。

数学期末考试题库及答案

数学期末考试题库及答案

数学期末考试题库及答案一、选择题(每题3分,共30分)1. 下列哪个选项是实数?A. √2B. iC. √-1D. 2/0答案:A2. 计算下列表达式的结果:(2x^2 - 3x + 1) - (x^2 + 2x - 3) = ?A. x^2 - 5x + 4B. x^2 - 5x + 2C. x^2 - x - 4D. x^2 - 5x - 2答案:A3. 一个等差数列的首项是2,公差是3,那么第10项是多少?A. 29B. 32C. 35D. 41答案:A4. 已知函数f(x) = 2x + 3,求f(-1)的值。

A. -1B. 1C. 5D. -5答案:D5. 一个圆的半径是5,那么它的面积是多少?A. 25πB. 50πC. 100πD. 125π答案:C6. 一个等比数列的首项是2,公比是2,那么第5项是多少?A. 32B. 64C. 128D. 256答案:A7. 已知一个三角形的两边长分别为3和4,夹角的余弦值为1/2,那么第三边的长度是多少?A. √7B. √13C. 5D. √34答案:C8. 计算下列表达式的值:(3x^2 - 2x + 1) / (x - 1) = ?A. 3x + 1B. 3x - 2C. 3x - 1D. 3x + 2答案:A9. 一个正方体的体积是27,那么它的表面积是多少?A. 54B. 108C. 216D. 486答案:A10. 已知一个函数y = kx + b,其中k = 2,b = 3,那么y = 5时,x的值是多少?A. 1B. 2C. 3D. 4答案:A二、填空题(每题4分,共20分)1. 已知一个等差数列的第3项是10,第5项是16,那么第7项是________。

答案:222. 计算函数f(x) = x^3 - 6x^2 + 11x - 6在x = 2时的值,f(2) = ________。

答案:13. 已知一个圆的直径是10,那么它的周长是________。

《高等数学》练习题库及答案

《高等数学》练习题库及答案

《高等数学》练习测试题库及答案一.选择题1.函数y=112+x 是( ) A.偶函数 B.奇函数 C 单调函数 D 无界函数2.设f(sin 2x )=cosx+1,则f(x)为( ) A 2x 2-2 B 2-2x 2 C 1+x 2 D 1-x 23.下列数列为单调递增数列的有( )A .0.9 ,0.99,0.999,0.9999B .23,32,45,54 C .{f(n)},其中f(n)=⎪⎩⎪⎨⎧-+为偶数,为奇数n nn n n n 1,1 D. {n n 212+} 4.数列有界是数列收敛的( )A .充分条件 B. 必要条件C.充要条件 D 既非充分也非必要5.下列命题正确的是( )A .发散数列必无界B .两无界数列之和必无界C .两发散数列之和必发散D .两收敛数列之和必收敛6.=--→1)1sin(lim 21x x x ( ) A.1 B.0 C.2 D.1/27.设=+∞→x x xk )1(lim e 6 则k=( ) A.1 B.2 C.6 D.1/68.当x →1时,下列与无穷小(x-1)等价的无穷小是( )A.x 2-1B. x 3-1C.(x-1)2D.sin(x-1)9.f(x)在点x=x 0处有定义是f(x)在x=x 0处连续的( )A.必要条件B.充分条件C.充分必要条件D.无关条件10、当|x|<1时,y= ( )A 、是连续的B 、无界函数C 、有最大值与最小值D 、无最小值11、设函数f(x)=(1-x)cotx要使f(x)在点:x=0连续,则应补充定义f(0)为()A、B、e C、-e D、-e-112、下列有跳跃间断点x=0的函数为()A、 xarctan1/xB、arctan1/xC、tan1/xD、cos1/x13、设f(x)在点x0连续,g(x)在点x不连续,则下列结论成立是()A、f(x)+g(x)在点x必不连续B、f(x)×g(x)在点x必不连续须有C、复合函数f[g(x)]在点x必不连续D、在点x0必不连续在区间(- ∞,+ ∞)上连续,且f(x)=0,则a,b满足14、设f(x)=()A、a>0,b>0B、a>0,b<0C、a<0,b>0D、a<0,b<015、若函数f(x)在点x0连续,则下列复合函数在x也连续的有()A、 B、C、tan[f(x)]D、f[f(x)]16、函数f(x)=tanx能取最小最大值的区间是下列区间中的()A、[0,л]B、(0,л)C、[-л/4,л/4]D、(-л/4,л/4)17、在闭区间[a ,b]上连续是函数f(x)有界的()A、充分条件B、必要条件C、充要条件D、无关条件18、f(a)f(b) <0是在[a,b]上连续的函f(x)数在(a,b)内取零值的()A、充分条件B、必要条件C、充要条件D、无关条件19、下列函数中能在区间(0,1)内取零值的有()A、f(x)=x+1B、f(x)=x-1C、f(x)=x2-1D、f(x)=5x4-4x+120、曲线y=x2在x=1处的切线斜率为()A、k=0B、k=1C、k=2D、-1/221、若直线y=x与对数曲线y=logax相切,则()A、eB、1/eC、e xD、e1/e22、曲线y=lnx平行于直线x-y+1=0的法线方程是()A、x-y-1=0B、x-y+3e-2=0C、x-y-3e-2=0D、-x-y+3e-2=023、设直线y=x+a与曲线y=2arctanx相切,则a=()A、±1B、±л/2C、±(л/2+1)D、±(л/2-1)24、设f(x)为可导的奇函数,且f`(x0)=a,则f`(-x)=()A、aB、-aC、|a|D、025、设y=㏑,则y’|x=0=()A、-1/2B、1/2C、-1D、026、设y=(cos)sinx,则y’|x=0=()A、-1B、0C、1D、不存在27、设yf(x)= ㏑(1+X),y=f[f(x)],则y’|x=0=()A、0B、1/ ㏑2C、1D、㏑228、已知y=sinx,则y(10)=()A、sinxB、cosxC、-sinxD、-cosx29、已知y=x㏑x,则y(10)=()A、-1/x9B、1/ x9C、8.1/x9D、 -8.1/x930、若函数f(x)=xsin|x|,则()A、f``(0)不存在B、f``(0)=0C、f``(0) =∞D、 f``(0)= л31、设函数y=yf(x)在[0,л]内由方程x+cos(x+y)=0所确定,则|dy/dx|x=0=()A 、-1B 、0C 、л/2D 、 232、圆x2cos θ,y=2sin θ上相应于θ=л/4处的切线斜率,K=( )A 、-1B 、0C 、1D 、 233、函数f(x)在点x 0连续是函数f(x)在x 0可微的( )A 、充分条件B 、必要条件C 、充要条件D 、无关条件34、函数f(x)在点x 0可导是函数f(x)在x 0可微的( )A 、充分条件B 、必要条件C 、充要条件D 、无关条件35、函数f(x)=|x|在x=0的微分是( )A 、0B 、-dxC 、dxD 、 不存在36、极限)ln 11(lim 1xx x x --→的未定式类型是( )A 、0/0型B 、∞/∞型C 、∞ -∞D 、∞型37、极限 012)sin lim(→x x x x 的未定式类型是( ) A 、00型 B 、0/0型 C 、1∞型 D 、∞0型 38、极限 x x x x sin 1sinlim 20→=( )A 、0B 、1C 、2D 、不存在39、x x 0时,n 阶泰勒公式的余项Rn(x)是较x x 0 的( )A 、(n+1)阶无穷小B 、n 阶无穷小C 、同阶无穷小D 、高阶无穷小40、若函数f(x)在[0, +∞]内可导,且f`(x) >0,xf(0) <0则f(x)在[0,+ ∞]内有( )A 、唯一的零点B 、至少存在有一个零点C 、没有零点D 、不能确定有无零点41、曲线y=x2-4x+3的顶点处的曲率为()A、2B、1/2C、1D、042、抛物线y=4x-x2在它的顶点处的曲率半径为()A、0B、1/2C、1D、243、若函数f(x)在(a,b)内存在原函数,则原函数有()A、一个B、两个C、无穷多个D、都不对44、若∫f(x)dx=2e x/2+C=()A、2e x/2B、4 e x/2C、e x/2 +CD、e x/245、∫xe-x dx =( D )A、xe-x -e-x +CB、-xe-x+e-x +CC、xe-x +e-x +CD、-xe-x -e-x +C46、设P(X)为多项式,为自然数,则∫P(x)(x-1)-n dx()A、不含有对数函数B、含有反三角函数C、一定是初等函数D、一定是有理函数0|3x+1|dx=()47、∫-1A、5/6B、1/2C、-1/2D、148、两椭圆曲线x2/4+y2=1及(x-1)2/9+y2/4=1之间所围的平面图形面积等于()A、лB、2лC、4лD、6л49、曲线y=x2-2x与x轴所围平面图形绕轴旋转而成的旋转体体积是()A、лB、6л/15C、16л/15D、32л/1550、点(1,0,-1)与(0,-1,1)之间的距离为()A、 B、2 C、31/2 D、 21/251、设曲面方程(P,Q)则用下列平面去截曲面,截线为抛物线的平面是()A、Z=4B、Z=0C、Z=-2D、x=252、平面x=a截曲面x2/a2+y2/b2-z2/c2=1所得截线为()A、椭圆B、双曲线C、抛物线D、两相交直线53、方程=0所表示的图形为()A 、原点(0,0,0)B 、三坐标轴C 、三坐标轴D 、曲面,但不可能为平面54、方程3x 2+3y 2-z 2=0表示旋转曲面,它的旋转轴是( )A 、X 轴B 、Y 轴C 、Z 轴D 、任一条直线55、方程3x 2-y 2-2z 2=1所确定的曲面是( )A 、双叶双曲面B 、单叶双曲面C 、椭圆抛物面D 、圆锥曲面 56下列命题正确的是( )A 、发散数列必无界B 、两无界数列之和必无界C 、两发散数列之和必发散D 、两收敛数列之和必收敛57.f(x)在点x=x 0处有定义是f(x)在x=x 0处连续的( )A 、.必要条件B 、充分条件C 、充分必要条件D 、无关条件58函数f(x)=tanx 能取最小最大值的区间是下列区间中的( )A 、[0,л]B 、(0,л)C 、[-л/4,л/4]D 、(-л/4,л/4)59下列函数中能在区间(0,1)内取零值的有( )A 、f(x)=x+1B 、f(x)=x-1C 、f(x)=x 2-1D 、f(x)=5x 4-4x+160设y=(cos)sinx ,则y’|x=0=( )A 、-1B 、0C 、1D 、 不存在二、填空题1、求极限1lim -→x (x 2+2x+5)/(x 2+1)=( ) 2、求极限 0lim →x [(x 3-3x+1)/(x-4)+1]=( ) 3、求极限2lim →x x-2/(x+2)1/2=( ) 4、求极限∞→x lim [x/(x+1)]x=( ) 5、求极限0lim →x (1-x)1/x= ( ) 6、已知y=sinx-cosx ,求y`|x=л/6=( )7、已知ρ=ψsin ψ+cos ψ/2,求d ρ/d ψ| ψ=л/6=( )8、已知f(x)=3/5x+x 2/5,求f`(0)=( )9、设直线y=x+a 与曲线y=2arctanx 相切,则a=( )10、函数y=x 2-2x+3的极值是y(1)=( )11、函数y=2x 3极小值与极大值分别是( )12、函数y=x 2-2x-1的最小值为( )13、函数y=2x-5x 2的最大值为( )14、函数f(x)=x 2e -x 在[-1,1]上的最小值为( )15、点(0,1)是曲线y=ax 3+bx 2+c 的拐点,则有b=() c=( ) 16、∫xx 1/2dx= ( )17、若F`(x)=f(x),则∫dF(x)= ( )18、若∫f(x)dx =x 2e 2x +c ,则f(x)= ( )19、d/dx ∫a barctantdt =( )20、已知函数f(x)=⎪⎩⎪⎨⎧=≠⎰-0,0,022)1(1x a x x t dt e x 在点x=0连续,则a=( )21、∫02(x 2+1/x 4)dx =( )22、∫49 x 1/2(1+x 1/2)dx=( )23、∫031/2a dx/(a 2+x 2)=( )24、∫01 dx/(4-x 2)1/2=( )25、∫л/3лsin (л/3+x)dx=( )26、∫49x 1/2(1+x 1/2)dx=( )27、∫49 x 1/2(1+x 1/2)dx=( )28、∫49x 1/2(1+x 1/2)dx=( )29、∫49 x 1/2(1+x 1/2)dx=( )30、∫49x 1/2(1+x 1/2)dx=( )31、∫49 x1/2(1+x1/2)dx=()32、∫49 x1/2(1+x1/2)dx=()33、满足不等式|x-2|<1的X所在区间为( )34、设f(x) = [x] +1,则f(л+10)=()35、函数Y=|sinx|的周期是()36、y=sinx,y=cosx直线x=0,x=л/2所围成的面积是()37、y=3-2x-x2与x轴所围成图形的面积是()38、心形线r=a(1+cosθ)的全长为()39、三点(1,1,2),(-1,1,2),(0,0,2)构成的三角形为()40、一动点与两定点(2,3,1)和(4,5,6)等距离,则该点的轨迹方程是()41、求过点(3,0,-1),且与平面3x-7y+5z-12=0平行的平面方程是()42、求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是( )43、求平行于xoz面且经过(2,-5,3)的平面方程是()44、通过Z轴和点(-3,1,-2)的平面方程是()45、平行于X轴且经过两点(4,0,-2)和(5,1,7)的平面方程是()46求极限lim [x/(x+1)]x=()x→∞47函数y=x2-2x+3的极值是y(1)=()9 x1/2(1+x1/2)dx=()48∫449y=sinx,y=cosx直线x=0,x=л/2所围成的面积是()50求过点(3,0,-1),且与平面3x-7y+5z-12=0平行的平面方程是()三、解答题1、设Y=2X-5X2,问X等于多少时Y最大?并求出其最大值。

高等数学(大一)题库

高等数学(大一)题库

(一)函数、极限、连续一、选择题:1、 在区间(-1,0)内,由( )所给出的函数是单调上升的。

(A);1+=x y (B);2x x y -= (C)34+-=x y (D)25-=x y2、 当+∞→x 时,函数f (x )=x sin x 是( )(A )无穷大量 (B )无穷小量 (C )无界函数 (D )有界函数 3、 当x →1时,31)(,11)(x x xxx f -=+-=ϕ都是无穷小,则f (x )是)(x ϕ的( ) (A )高阶无穷小 (B )低阶无穷小 (C )同阶无穷小 (D )等阶无穷小 4、 x =0是函数1()arctanf x x=的( ) (A )可去间断点 (B )跳跃间断点; (C )振荡间断点 (D )无穷间断点 5、 下列的正确结论是( )(A ))(lim x f xx →若存在,则f (x )有界;(B )若在0x 的某邻域内,有()()(),g x f x h x ≤≤且),(lim 0x g x x →),(lim 0x h x x →都存在,则),(lim 0x f x x →也 存在;(C )若f(x)在闭区间[a , b ]上连续,且f (a ), f (b )<0则方程f (x )=0,在(a , b )内有唯一的实根;(D ) 当∞→x 时,xx x x x a sin )(,1)(==β都是无穷小,但()x α与)(x β却不能比.二、填空题:1、 若),1(3-=x f y Z且x Zy ==1则f (x )的表达式为 ;2、 已知数列n x n 1014-=的极限是4, 对于,1011=ε满足n >N 时,总有ε<-4n x 成立的最小N 应是 ;3、 3214lim 1x x ax x b x →---+=+(b 为有限数) , 则a = , b = ; 4、 设,)(ax ax x f --=则x =a 是f (x )的第 类 间断点; 5、 ,0,;0,)(,sin )(⎩⎨⎧>+≤-==x n x x n x x g x x f 且f [g (x )]在R 上连续,则n = ;三、 计算题:1、计算下列各式极限: (1)xx x x sin 2cos 1lim0-→; (2)x xx x -+→11ln 1lim 0;(3))11(lim 220--+→x x x (4)xx x x cos 11sinlim30-→ (5)x x x 2cos 3sin lim 0→ (6)xx xx sin cos ln lim0→2、确定常数a , b ,使函数⎪⎩⎪⎨⎧-<<∞---=<<-+=1,11,11,arccos )(2x x x b x x a x f 在x =-1处连续.四、证明:设f (x )在闭区间[a , b ]上连续,且a <f (x )<b , 证明在(a , b )内至少有一点ξ,使()f ξξ=.(二)导数与微分一、填空题:1、 设0()f x '存在,则t t x f t x f t )()(lim 000+--+→= ;2、 ,1,321,)(32⎪⎩⎪⎨⎧≤>=x x x x x f 则(1)f '= ; 3、 设xey 2sin =, 则dy = ;4、 设),0(sin >=x x x y x则=dxdy; 5、 y =f (x )为方程x sin y + y e 0=x确定的隐函数, 则(0)f '= .二、选择题:1、)0(),1ln()(2>+=-a a x f x 则(0)f '的值为( )(A) –ln a (B) ln a (C)a ln 21 (D) 21 2、 设曲线21x e y -=与直线1x =-相交于点P , 曲线过点P 处的切线方程为( )(A) 2x -y -2=0 (B) 2x +y +1=0 (C) 2x +y -3=0 (D) 2x -y +3=03、 设⎪⎩⎪⎨⎧>-≤=0),1(0)(2x x b x e x f ax 处处可导,则( )(A) a =b =1 (B) a =-2, b =-1 (C) a =0, b =1 (D) a =2, b =14、 若f (x )在点x 可微,则x dyy x ∆-∆→∆0lim的值为( )(A) 1 (B) 0 (C) -1 (D) 不确定5、设y =f (sin x ), f (x )为可导函数,则dy 的表达式为( )(A)(sin )f x dx ' (B)(cos )f x dx ' (C)(sin )cos f x x ' (D)(sin )cos f x xdx '三、计算题:1、 设对一切实数x 有f (1+x )=2f (x ),且(0)0f '=,求(1)f '2、 若g(x)=⎪⎩⎪⎨⎧=≠0,00,1cos 2x x x x 又f (x )在x =0处可导,求))((=x x g f dx d3、 求曲线⎩⎨⎧=++=-+010)1(y te t t x y 在t =0处的切线方程4、 f (x )在x =a 处连续,),()sin()(x f a x x -=ϕ求)('a ϕ5、 设3222()x y y u x x =+⋅=+, 求.dudy 6、 设()ln f x x x =, 求()()n fx . 7、 计算39.02的近似值.(三)中值定理与导数的应用一、填空题:1、 函数f (x )=arctan x 在[0 ,1]上使拉格朗日中值定理结论成立的ξ= ;2、 若01lim sin 22ax x e b x →-=则a = , b = ; 3、 设f (x )有连续导数,且(0)(0)1f f '==则)(ln )0()(sin lim 0x f f x f x -→= ;4、 x e yx sin =的极大值为 ,极小值为 ;5、)10(11≤≤+-=x xxarctg y 的最大值为 ,最小值为 . 二、选择题:1、 如果a,b 是方程f(x)=0的两个根,函数f(x)在[a,b]上满足罗尔定理条件,那么方程f’(x)=0在(a,b)内( )(A )仅有一个根; (B )至少有一个根; (C )没有根; (D )以上结论都不对。

自动控制原理试题库(含参考答案)

自动控制原理试题库(含参考答案)

一、填空题(每空1分,共15分)1、反馈控制又称偏差控制,其控制作用是通过给定值与反馈量的差值进行的。

2、复合控制有两种基本形式:即按输入的前馈复合控制和按扰动的前馈复合控制。

3、两个传递函数分别为G1(s)与G2(s)的环节,以并联方式连接,其等效传递函数为()G s,则G(s)为G1(s)+G2(s)(用G1(s)与G2(s)表示)。

4、典型二阶系统极点分布如图1所示,ω,则无阻尼自然频率=n7其相应的传递函数为,由于积分环节的引入,可以改善系统的稳态性能。

1、在水箱水温控制系统中,受控对象为水箱,被控量为水温。

2、自动控制系统有两种基本控制方式,当控制装置与受控对象之间只有顺向作用而无反向联系时,称为开环控制系统;当控制装置与受控对象之间不但有顺向作用而且还有反向联系时,称为闭环控制系统;含有测速发电机的电动机速度控制系统,属于闭环控制系统。

3、稳定是对控制系统最基本的要求,若一个控制系统的响应曲线为衰减振荡,则该系统稳定。

判断一个闭环线性控制系统是否稳定,在时域分析中采用劳斯判据;在频域分析中采用奈奎斯特判据。

4、传递函数是指在零初始条件下、线性定常控制系统的输出拉氏变换与输入拉氏变换之比。

5、设系统的开环传递函数为2(1)(1)K s s Ts τ++arctan 180arctan T τωω--。

6、频域性能指标与时域性能指标有着对应关系,开环频域性能指标中的幅值穿越频率c ω对应时域性能指标调整时间s t ,它们反映了系统动态过程的。

1、对自动控制系统的基本要求可以概括为三个方面,即:稳定性、快速性和准确性。

是指闭环传系统的性能要求可以概括为三个方面,即:稳定性、准确性和快速性,其中最基本的要求是稳定性。

2、若某单位负反馈控制系统的前向传递函数为()G s ,则该系统的开环传递函数为()G s 。

3、能表达控制系统各变量之间关系的数学表达式或表示方法,叫系统的数学模型,在古典控制理论中系统数学模型有微分方程、传递函数等。

大学数学线性代数题库及答案解析

大学数学线性代数题库及答案解析

大学数学线性代数题库及答案解析1. 求解方程组a) 3x + 2y - z = 7-x + 3y + 2z = -112x - y + 4z = 5解析:首先,我们可以使用增广矩阵表示方程组:[ 3, 2, -1, 7;-1, 3, 2, -11;2, -1, 4, 5 ]接下来,通过行初等变换将矩阵化为阶梯形:[ 3, 2, -1, 7;0, 7/4, 3/4, -21/4;0, 0, 9/7, 4/7 ]从第三行可以得到 z = 4/7,代入第二行可得 y = -21/7,再代入第一行可以得到 x = 3。

因此,方程组的解为 x = 3, y = -3, z = 4/7。

b) 2x + 3y + 2z = 10x - y + z = 44x + 2y + z = 12解析:同样,我们使用增广矩阵表示方程组:[ 2, 3, 2, 10;1, -1, 1, 4;4, 2, 1, 12 ]通过行初等变换将矩阵化为阶梯形:[ 2, 3, 2, 10;0, -5, -1, -6;0, 0, 0, 0 ]从第二行可以得到 -5y - z = -6,即 z = -6 + 5y。

我们可以令 y = t,其中 t 为任意常数。

则得到 z = -6 + 5t。

将 z 的值代入第一行可以得到x = 4 - 3t。

因此,方程组的解可以表示为 x = 4 - 3t, y = t, z = -6 + 5t。

2. 求解线性方程组的向量空间a) 给定矩阵 A = [1, 2, -1; 2, 4, -2; 3, 6, -3],求解 A 的列空间。

解析:列空间由矩阵 A 的列向量张成。

我们可以计算矩阵 A 的列向量组的极简形式:[ 1, 2, -1;2, 4, -2;3, 6, -3 ]通过初等行变换得到:[ 1, 2, -1;0, 0, 0;0, 0, 0 ]可以看出,第一列是主列,而第二列和第三列都是自由列。

因此,矩阵 A 的列空间可以表示为 Span{[1, 2, -1]}。

自动控制原理试题库完整(2)

自动控制原理试题库完整(2)

⾃动控制原理试题库完整(2)⼀、选择题1. 在伯德图中反映系统抗⾼频⼲扰能⼒的是( C )A. 低频段B. 中频段C. ⾼频段D. ⽆法反映2. 对于⼀、⼆阶系统来说,系统特征⽅程的系数都是正数是系统稳定的( C )A. 充分条件B. 必要条件C. 充分必要条件D. 以上都不是3. 开环传递函数G(s)H(s)=)p s )(p s ()z s (K 211+++,其中p 2>z 1>p 1>0,则实轴上的根轨迹为(A )A.(-∞,-p 2] [-z 1,-p 1]B. (- ∞,-p 2]C. [-p 1,+ ∞)D. [-z 1,-p 1]4. ⼆阶振荡环节的相频特性θ(ω) ,当ω→∞ 时,其相位移θ(ω) 为( B )A .-270°B .-180°C .-90°D .0°5. ⽤频域法分析控制系统时,最常⽤的典型输⼊信号是( D )A. 脉冲函数B. 斜坡函数C. 阶跃函数D. 正弦函数 6. 确定根轨迹与虚轴的交点,可⽤(A)A .劳斯判据B .幅⾓条件C .幅值条件D .dk/ds=07. 设⼀单位反馈控制系统的开环传递函数为)2(4s (G 0+=s s K ),要求20K v =,则K=( A )A .10B .20C .30D .408. 过阻尼系统的动态性能指标是调整时间s t 和( C )A .峰值时间p tB .最⼤超调量σC .上升时间r tD .衰减⽐σ/σ′ 9. 设某系统开环传递函数为)1)(10s s (10s (G 2+++=s ),则其频率特性奈⽒图起点坐标为( C ) A .(-10,j0) B .(-1,j0) C .(1,j0) D .(10,j0)10. ⼀阶系统1TS K S (G +=)的时间常数T 越⼤,则系统的输出响应达到稳态值的时间( A ) A .越长 B .越短 C .不变 D .不定11. 当⼆阶系统的根分布在根平⾯的虚轴上时,系统的阻尼⽐为( B )A .ξ<0B .ξ=0C .0<ξ<1D .ξ≥ 112. 同⼀系统,不同输⼊信号和输出信号之间传递函数的特征⽅程(A )A .相同B .不同C .不存在D .不定13. 传递函数反映了系统的动态性能,它与下列哪项因素有关?(C )A. 输⼊信号B. 初始条件C. 系统的结构参数D. 输⼊信号和初始条件14. 奈奎斯特稳定性判据是利⽤系统的( C ) 来判断闭环系统稳定性的⼀个判别准则。

高等数学试题库

高等数学试题库

高等数学试题库(总44页) -CAL-FENGHAI.-(YICAI)-Company One1-CAL-本页仅作为文档封面,使用请直接删除《高等数学》试题库一、选择题 (一)函数1、下列集合中( )是空集。

{}{}4,3,02,1,0. a {}{}7,6,53,2,1. b (){}x y x y y x c 2,.==且 {}01.≥〈x x x d 且2、下列各组函数中是相同的函数有( )。

()()()2,.x x g x x f a == ()()2,.x x g x x f b ==()()x x x g x f c 22cos sin ,1.+== ()()23,.x x g xx x f d ==3、函数()5lg 1-=x x f 的定义域是( )。

()()+∞∞-,55,. a ()()+∞∞-,66,. b()()+∞∞-,44,. c ()()()()+∞∞-,66,55,44,. d4、设函数()⎪⎩⎪⎨⎧-+2222x x x 〈+∞≤〈≤〈∞〈-x x x 2200 则下列等式中,不成立的是( )。

()()10.f f a = ()()10.-=f f b ()()22.f f c =- ()()31.f f d =-5、下列函数中,( )是奇函数。

x xa . x xb sin .211.+-x x a a c 21010.xx d -- 6、下列函数中,有界的是( )。

arctgx y a =. tgx y b =. x y c 1.= x y d 2.=7、若()()11-=-x x x f ,则()=x f ( )。

()1.+x x a ()()21.--x x b ()1.-x x c .d 不存在8、函数x y sin =的周期是( )。

π4.a π2.b π.c 2.πd 9、下列函数不是复合函数的有( )。

xy a ⎪⎭⎫ ⎝⎛=21. ()21.x y b --= x y c sin lg .= xey d sin 1.+=10、下列函数是初等函数的有( )。

自动控制原理试题库(含答案)

自动控制原理试题库(含答案)

一、填空题(每空 1 分,共15分)1、反馈控制又称偏差控制,其控制作用是通过给定值与反馈量的差值进行的。

2、复合控制有两种基本形式:即按输入的前馈复合控制和按扰动的前馈复合控制。

3、两个传递函数分别为G 1(s )与G 2(s)的环节,以并联方式连接,其等效传递函数为()G s ,则G (s)为G1(s )+G2(s )(用G 1(s)与G 2(s) 表示)。

4、典型二阶系统极点分布如图1所示,则无阻尼自然频率=nω,阻尼比=ξ,0.7072= 该系统的特征方程为2220s s ++= ,该系统的单位阶跃响应曲线为衰减振荡。

5、若某系统的单位脉冲响应为0.20.5()105t t g t e e --=+,则该系统的传递函数G(s)为1050.20.5s s s s+++. 6、根轨迹起始于开环极点,终止于开环零点.7、设某最小相位系统的相频特性为101()()90()tg tg T ϕωτωω--=--,则该系统的开环传递函数为(1)(1)K s s Ts τ++.8、PI 控制器的输入-输出关系的时域表达式是1()[()()]p u t K e t e t dt T =+⎰, 其相应的传递函数为1[1]p K Ts +,由于积分环节的引入,可以改善系统的稳态性能.1、在水箱水温控制系统中,受控对象为水箱,被控量为水温。

2、自动控制系统有两种基本控制方式,当控制装置与受控对象之间只有顺向作用而无反向联系时,称为开环控制系统;当控制装置与受控对象之间不但有顺向作用而且还有反向联系时,称为闭环控制系统;含有测速发电机的电动机速度控制系统,属于闭环控制系统。

3、稳定是对控制系统最基本的要求,若一个控制系统的响应曲线为衰减振荡,则该系统稳定。

判断一个闭环线性控制系统是否稳定,在时域分析中采用劳斯判据;在频域分析中采用奈奎斯特判据。

4、传递函数是指在零初始条件下、线性定常控制系统的输出拉氏变换与输入拉氏变换之比。

小学三年级数学两位数除以一位数题库(600道)

小学三年级数学两位数除以一位数题库(600道)

<2>48 ÷ 8 =<3>27 ÷ 3 =<4>52 ÷ 4 =<5>25 ÷ 5 =<2>28 ÷ 4 =<3>91 ÷ 7 =<4>40 ÷ 8 =<5>54 ÷ 9 =<2>42 ÷ 6 =<3>63 ÷ 7 =<4>72 ÷ 9 =<5>27 ÷ 9 =<2>40 ÷ 2 =<3>54 ÷ 6 =<4>84 ÷ 7 =<5>84 ÷ 6 =<2>20 ÷ 5 =<3>20 ÷ 2 =<4>35 ÷ 7 =<5>28 ÷ 7 =<2>96 ÷ 2 =<3>40 ÷ 4 =<4>78 ÷ 6 =<5>36 ÷ 9 =<2>40 ÷ 8 =<3>65 ÷ 5 =<4>28 ÷ 7 =<5>27 ÷ 3 =<2>84 ÷ 2 =<3>63 ÷ 7 =<4>16 ÷ 8 =<5>90 ÷ 9 =<2>40 ÷ 8 =<3>60 ÷ 2 =<4>9 ÷ 9 =<5>28 ÷ 7 =<2>24 ÷ 6 =<3>18 ÷ 9 =<4>36 ÷ 3 =<5>32 ÷ 8 =<2>40 ÷ 8 =<3>30 ÷ 5 =<4>54 ÷ 2 =<5>16 ÷ 8 =<2>16 ÷ 4 =<3>95 ÷ 5 =<4>75 ÷ 5 =<5>74 ÷ 2 =<2>72 ÷ 6 =<3>45 ÷ 9 =<4>55 ÷ 5 =<5>63 ÷ 9 =<2>80 ÷ 4 =<3>72 ÷ 8 =<4>66 ÷ 3 =<5>45 ÷ 5 =<2>99 ÷ 3 =<3>91 ÷ 7 =<4>90 ÷ 5 =<5>49 ÷ 7 =<2>84 ÷ 7 =<3>92 ÷ 4 =<4>90 ÷ 6 =<5>64 ÷ 2 =<2>20 ÷ 2 =<3>84 ÷ 7 =<4>84 ÷ 2 =<5>42 ÷ 3 =<2>70 ÷ 7 =<3>64 ÷ 4 =<4>64 ÷ 8 =<5>84 ÷ 7 =<2>42 ÷ 2 =<3>81 ÷ 3 =<4>64 ÷ 8 =<5>77 ÷ 7 =<2>18 ÷ 9 =<3>26 ÷ 2 =<4>34 ÷ 2 =<5>72 ÷ 3 =<2>9 ÷ 9 =<3>18 ÷ 2 =<4>28 ÷ 7 =<5>60 ÷ 5 =<2>96 ÷ 4 =<3>72 ÷ 9 =<4>72 ÷ 9 =<5>63 ÷ 9 =<2>66 ÷ 6 =<3>14 ÷ 7 =<4>25 ÷ 5 =<5>90 ÷ 9 =<2>56 ÷ 8 =<3>9 ÷ 9 =<4>18 ÷ 9 =<5>9 ÷ 9 =<2>38 ÷ 2 =<3>68 ÷ 4 =<4>60 ÷ 5 =<5>90 ÷ 9 =<2>85 ÷ 5 =<3>90 ÷ 5 =<4>42 ÷ 6 =<5>88 ÷ 2 =<2>52 ÷ 2 =<3>81 ÷ 9 =<4>72 ÷ 2 =<5>75 ÷ 5 =<2>80 ÷ 5 =<3>24 ÷ 4 =<4>48 ÷ 3 =<5>20 ÷ 2 =<2>60 ÷ 5 =<3>90 ÷ 6 =<4>54 ÷ 6 =<5>50 ÷ 5 =<2>72 ÷ 9 =<3>72 ÷ 9 =<4>10 ÷ 5 =<5>72 ÷ 6 =<2>54 ÷ 3 =<3>90 ÷ 5 =<4>66 ÷ 2 =<5>33 ÷ 3 =<2>32 ÷ 4 =<3>8 ÷ 8 =<4>84 ÷ 4 =<5>64 ÷ 4 =<2>70 ÷ 7 =<3>72 ÷ 8 =<4>35 ÷ 7 =<5>64 ÷ 2 =<2>15 ÷ 5 =<3>60 ÷ 4 =<4>86 ÷ 2 =<5>42 ÷ 3 =<2>90 ÷ 9 =<3>15 ÷ 5 =<4>30 ÷ 2 =<5>64 ÷ 8 =<2>50 ÷ 5 =<3>28 ÷ 7 =<4>57 ÷ 3 =<5>56 ÷ 8 =<2>36 ÷ 6 =<3>72 ÷ 6 =<4>45 ÷ 5 =<5>16 ÷ 2 =<2>64 ÷ 8 =<3>60 ÷ 3 =<4>91 ÷ 7 =<5>90 ÷ 2 =<2>14 ÷ 2 =<3>27 ÷ 9 =<4>94 ÷ 2 =<5>24 ÷ 4 =<2>63 ÷ 7 =<3>30 ÷ 2 =<4>50 ÷ 5 =<5>18 ÷ 9 =<2>32 ÷ 8 =<3>9 ÷ 9 =<4>48 ÷ 8 =<5>24 ÷ 2 =<2>14 ÷ 7 =<3>70 ÷ 2 =<4>42 ÷ 7 =<5>64 ÷ 2 =<2>45 ÷ 9 =<3>84 ÷ 3 =<4>18 ÷ 9 =<5>36 ÷ 4 =<2>96 ÷ 6 =<3>76 ÷ 4 =<4>16 ÷ 4 =<5>87 ÷ 3 =<2>36 ÷ 9 =<3>72 ÷ 6 =<4>45 ÷ 9 =<5>39 ÷ 3 =<2>55 ÷ 5 =<3>40 ÷ 8 =<4>9 ÷ 9 =<5>60 ÷ 4 =<2>88 ÷ 8 =<3>49 ÷ 7 =<4>24 ÷ 6 =<5>75 ÷ 3 =<2>50 ÷ 2 =<3>35 ÷ 7 =<4>72 ÷ 4 =<5>51 ÷ 3 =<2>36 ÷ 6 =<3>8 ÷ 8 =<4>60 ÷ 4 =<5>70 ÷ 7 =<2>78 ÷ 6 =<3>39 ÷ 3 =<4>80 ÷ 4 =<5>16 ÷ 4 =<2>72 ÷ 6 =<3>36 ÷ 3 =<4>45 ÷ 5 =<5>10 ÷ 5 =<2>24 ÷ 3 =<3>64 ÷ 4 =<4>93 ÷ 3 =<5>18 ÷ 9 =<2>96 ÷ 4 =<3>30 ÷ 5 =<4>33 ÷ 3 =<5>52 ÷ 4 =<2>35 ÷ 7 =<3>54 ÷ 6 =<4>24 ÷ 6 =<5>36 ÷ 3 =<2>16 ÷ 8 =<3>88 ÷ 2 =<4>54 ÷ 6 =<5>21 ÷ 7 =<2>84 ÷ 4 =<3>26 ÷ 2 =<4>45 ÷ 5 =<5>85 ÷ 5 =<2>28 ÷ 7 =<3>9 ÷ 9 =<4>42 ÷ 6 =<5>56 ÷ 8 =<2>30 ÷ 6 =<3>8 ÷ 4 =<4>10 ÷ 2 =<5>60 ÷ 6 =<2>84 ÷ 7 =<3>21 ÷ 7 =<4>65 ÷ 5 =<5>18 ÷ 9 =<2>40 ÷ 5 =<3>80 ÷ 4 =<4>7 ÷ 7 =<5>56 ÷ 2 =<2>90 ÷ 9 =<3>12 ÷ 2 =<4>84 ÷ 4 =<5>96 ÷ 8 =<2>40 ÷ 8 =<3>45 ÷ 9 =<4>56 ÷ 4 =<5>8 ÷ 4 =<2>80 ÷ 5 =<3>40 ÷ 2 =<4>48 ÷ 8 =<5>18 ÷ 6 =<2>20 ÷ 5 =<3>90 ÷ 9 =<4>76 ÷ 2 =<5>75 ÷ 3 =<2>91 ÷ 7 =<3>8 ÷ 8 =<4>6 ÷ 6 =<5>42 ÷ 7 =<2>10 ÷ 5 =<3>44 ÷ 4 =<4>32 ÷ 4 =<5>9 ÷ 9 =<2>25 ÷ 5 =<3>30 ÷ 3 =<4>42 ÷ 2 =<5>35 ÷ 7 =<2>88 ÷ 8 =<3>48 ÷ 8 =<4>75 ÷ 3 =<5>72 ÷ 8 =<2>10 ÷ 2 =<3>90 ÷ 9 =<4>36 ÷ 6 =<5>56 ÷ 7 =<2>24 ÷ 2 =<3>10 ÷ 5 =<4>42 ÷ 2 =<5>80 ÷ 4 =<2>44 ÷ 4 =<3>77 ÷ 7 =<4>88 ÷ 8 =<5>33 ÷ 3 =<2>95 ÷ 5 =<3>90 ÷ 9 =<4>21 ÷ 3 =<5>78 ÷ 6 =<2>28 ÷ 7 =<3>95 ÷ 5 =<4>78 ÷ 2 =<5>96 ÷ 8 =<2>66 ÷ 2 =<3>50 ÷ 5 =<4>10 ÷ 5 =<5>78 ÷ 6 =<2>27 ÷ 9 =<3>60 ÷ 4 =<4>48 ÷ 6 =<5>48 ÷ 3 =<2>70 ÷ 5 =<3>30 ÷ 3 =<4>56 ÷ 8 =<5>56 ÷ 8 =<2>45 ÷ 5 =<3>25 ÷ 5 =<4>32 ÷ 8 =<5>18 ÷ 9 =<2>60 ÷ 4 =<3>40 ÷ 8 =<4>33 ÷ 3 =<5>16 ÷ 8 =<2>64 ÷ 4 =<3>44 ÷ 4 =<4>70 ÷ 7 =<5>72 ÷ 6 =<2>24 ÷ 2 =<3>90 ÷ 5 =<4>30 ÷ 6 =<5>84 ÷ 7 =<2>56 ÷ 8 =<3>18 ÷ 9 =<4>28 ÷ 7 =<5>48 ÷ 8 =<2>14 ÷ 2 =<3>42 ÷ 2 =<4>12 ÷ 6 =<5>32 ÷ 2 =<2>80 ÷ 8 =<3>64 ÷ 2 =<4>12 ÷ 6 =<5>72 ÷ 8 =<2>63 ÷ 3 =<3>80 ÷ 4 =<4>25 ÷ 5 =<5>9 ÷ 9 =<2>56 ÷ 8 =<3>24 ÷ 4 =<4>24 ÷ 8 =<5>9 ÷ 9 =<2>60 ÷ 4 =<3>72 ÷ 3 =<4>20 ÷ 2 =<5>51 ÷ 3 =<2>40 ÷ 8 =<3>70 ÷ 5 =<4>21 ÷ 7 =<5>63 ÷ 9 =<2>80 ÷ 8 =<3>60 ÷ 6 =<4>7 ÷ 7 =<5>38 ÷ 2 =<2>35 ÷ 7 =<3>16 ÷ 8 =<4>24 ÷ 8 =<5>21 ÷ 7 =<2>48 ÷ 6 =<3>54 ÷ 9 =<4>30 ÷ 6 =<5>32 ÷ 2 =<2>18 ÷ 9 =<3>84 ÷ 6 =<4>54 ÷ 2 =<5>60 ÷ 4 =<2>85 ÷ 5 =<3>27 ÷ 9 =<4>84 ÷ 7 =<5>56 ÷ 2 =<2>92 ÷ 4 =<3>49 ÷ 7 =<4>27 ÷ 9 =<5>76 ÷ 4 =<2>48 ÷ 3 =<3>64 ÷ 8 =<4>8 ÷ 4 =<5>84 ÷ 6 =<2>92 ÷ 2 =<3>45 ÷ 9 =<4>78 ÷ 3 =<5>75 ÷ 5 =<2>35 ÷ 7 =<3>30 ÷ 2 =<4>62 ÷ 2 =<5>54 ÷ 3 =<2>36 ÷ 9 =<3>55 ÷ 5 =<4>75 ÷ 3 =<5>70 ÷ 7 =<2>24 ÷ 6 =<3>72 ÷ 9 =<4>88 ÷ 8 =<5>78 ÷ 6 =<2>32 ÷ 4 =<3>28 ÷ 4 =<4>51 ÷ 3 =<5>56 ÷ 8 =<2>91 ÷ 7 =<3>65 ÷ 5 =<4>63 ÷ 9 =<5>56 ÷ 7 =<2>52 ÷ 4 =<3>21 ÷ 7 =<4>40 ÷ 5 =<5>84 ÷ 7 =<2>76 ÷ 4 =<3>9 ÷ 3 =<4>36 ÷ 9 =<5>32 ÷ 8 =<2>64 ÷ 8 =<3>45 ÷ 9 =<4>38 ÷ 2 =<5>72 ÷ 9 =<2>24 ÷ 8 =<3>21 ÷ 7 =<4>40 ÷ 4 =<5>18 ÷ 2 =<2>56 ÷ 7 =<3>63 ÷ 9 =<4>18 ÷ 9 =<5>90 ÷ 3 =<2>98 ÷ 2 =<3>81 ÷ 3 =<4>54 ÷ 9 =<5>8 ÷ 8 =<2>96 ÷ 3 =<3>80 ÷ 2 =<4>84 ÷ 2 =<5>72 ÷ 6 =<2>54 ÷ 9 =<3>68 ÷ 4 =<4>30 ÷ 6 =<5>96 ÷ 3 =<2>42 ÷ 6 =<3>27 ÷ 9 =<4>30 ÷ 2 =<5>50 ÷ 5 =<2>30 ÷ 5 =<3>87 ÷ 3 =<4>60 ÷ 3 =<5>30 ÷ 6 =<2>27 ÷ 9 =<3>14 ÷ 7 =<4>80 ÷ 4 =<5>60 ÷ 4 =<2>32 ÷ 8 =<3>91 ÷ 7 =<4>90 ÷ 6 =<5>9 ÷ 9 =<2>27 ÷ 9 =<3>55 ÷ 5 =<4>15 ÷ 5 =<5>81 ÷ 9 =<2>72 ÷ 3 =<3>99 ÷ 3 =<4>70 ÷ 7 =<5>60 ÷ 5 =<2>96 ÷ 3 =<3>88 ÷ 8 =<4>72 ÷ 6 =<5>18 ÷ 9 =<2>72 ÷ 3 =<3>96 ÷ 4 =<4>42 ÷ 2 =<5>78 ÷ 6 =<2>98 ÷ 7 =<3>18 ÷ 3 =<4>40 ÷ 8 =<5>70 ÷ 7 =<2>96 ÷ 4 =<3>54 ÷ 9 =<4>66 ÷ 6 =<5>36 ÷ 9 =<2>70 ÷ 7 =<3>81 ÷ 9 =<4>45 ÷ 9 =<5>66 ÷ 6 =<2>76 ÷ 4 =<3>55 ÷ 5 =<4>38 ÷ 2 =<5>63 ÷ 3 =。

2023年高考-数学(理科)考试备考题库附带答案9

2023年高考-数学(理科)考试备考题库附带答案9

2023年高考-数学(理科)考试备考题库附带答案第1卷一.全考点押密题库(共50题)1.(单项选择题)(每题 5.00 分) 已知A,B 是球 O 的球面上两点,∠AOB = 90° ,C为该球面上的动点。

若三棱锥 O - ABC 体积的最大值为36,则球 O 的表面积为A. 36πB. 64πC. 144πD. 256π正确答案:C,2.(填空题)(每题 5.00 分) 已知圆锥的顶点为S,母线SA,SB所成角的余弦值为7/8,SA与圆锥底面所成角为45°.若△SAB的面积为5√15,则该圆锥的侧面积为.正确答案:40√2π,3.(单项选择题)(每题 5.00 分) 记SN.为等差数列αN}的前n项和.若3S3=S2+S4,α=2,则α5= {A. -12B. -10C. 10D. 12正确答案:B,4.(填空题)(每题5.00 分) 已知函数f(x)=2sinx+sin2x,则f(x)的最小值是_______?正确答案:-3√3/2,5.(单项选择题)(每题 5.00 分) 双曲线x2/α2-y2/b2=1(α>0,b>0)的离心率为√3,则其渐近线方程为A. y=±√2xB. y=±√3xC. y=±√2/2xD. y=±√3/2x正确答案:A,6.(单项选择题)(每题 5.00 分) 已知正方体的棱长为1,每条棱所在直线与平面α所成的角都相等,则α截此正方体所得截面面积的最大值为A. 3√3/4B. 2√3/3C. 3√2/4D. √3/2正确答案:A,7.(单项选择题)(每题 5.00 分) 已知集合A=x∣x2-x-2>0},则CRA={A. x∣-12}{D. {x∣x≦-1}∪{x∣x≧2}正确答案:B,8.(单项选择题)(每题 5.00 分) 在△ABC中,cos C/2=√5/5,BC=1,AC=5,则AB=A. 4√2B. √30C. √29D. 2√5正确答案:A,9.(填空题)(每题 5.00 分) 某髙科技企业生产产品 A 和产品 B 需要甲、乙两种新型材料。

自动控制原理试题库20套和答案详解

自动控制原理试题库20套和答案详解

第 1 页一、填空(每空1分,共18分)1.自动控制系统的数学模型有 、 、 、共4种。

2.连续控制系统稳定的充分必要条件是 。

离散控制系统稳定的充分必要条件是 。

3.某统控制系统的微分方程为:dtt dc )(+0.5C(t)=2r(t)。

则该系统的闭环传递函数 Φ(s)= ;该系统超调σ%= ;调节时间t s (Δ=2%)= 。

4.某单位反馈系统G(s)=)402.0)(21.0()5(1002+++s s s s ,则该系统是 阶 型系统;其开环放大系数K= 。

5.已知自动控制系统L(ω)曲线为:则该系统开环传递函数G(s)= ;ωC = 。

6.相位滞后校正装置又称为 调节器,其校正作用是 。

7.采样器的作用是 ,某离散控制系统)()1()1()(10210TT e Z Z e Z G -----=(单位反馈T=0.1)当输入r(t)=t 时.该系统稳态误差为 。

二. 1.求:)()(S R S C (10分)R(s)第2页2.求图示系统输出C(Z)的表达式。

(4分)四.反馈校正系统如图所示(12分)求:(1)K f=0时,系统的ξ,ωn和在单位斜坡输入下的稳态误差e ss.(2)若使系统ξ=0.707,k f应取何值?单位斜坡输入下e ss.=?第 3 页(1) (2) (3)五.已知某系统L (ω)曲线,(12分)(1)写出系统开环传递函数G (s ) (2)求其相位裕度γ(3)欲使该系统成为三阶最佳系统.求其K=?,γmax =?六、已知控制系统开环频率特性曲线如图示。

P 为开环右极点个数。

г为积分环节个数。

判别系统闭环后的稳定性。

第 4 页七、已知控制系统的传递函数为)1005.0)(105.0(10)(0++=s s s G 将其教正为二阶最佳系统,求校正装置的传递函数G 0(S )。

(12分)一.填空题。

(10分)1.传递函数分母多项式的根,称为系统的2. 微分环节的传递函数为3.并联方框图的等效传递函数等于各并联传递函数之4.单位冲击函数信号的拉氏变换式5.系统开环传递函数中有一个积分环节则该系统为 型系统。

小学二年级数学(上学期)口算常规题库含答案可直接打印

小学二年级数学(上学期)口算常规题库含答案可直接打印

二年级上学期数学口算题(1)班级姓名成绩11 - 7 = 10 + 24 = 40 - 1 = 24 + 46 = 45 + 5 = 46 - 41 = 26 + 46 = 8 + 49 = 36 - 13 = 17 - 9 = 19 + 30 = 26 + 38 = 45 + 12 = 42 + 26 = 27 + 21 = 41 + 50 = 48 + 50 = 39 + 42 = 24 + 43 = 39 - 20 = 28 ÷ 4 = 80 ÷ 5 = 54 ÷ 2 = 24 ÷ 4 =50 ÷ 5 = 9 × 6 = 7 × 7 = 3 × 4 = 2 × 8 = 7 × 2 = 54 ÷ 6 = 3 × 2 = 30 ÷ 6 = 8 × 6 = 60 ÷ 5 = 6 × 7 = 四七( )十八八八( )十四二( )十六 ( )三得九三( )十五 ( )八四十八 ( )八三十二 ( )九三十六28 + 34 - 15 = 28 + 34 + 15 = 2 + 27 + 57 = 5 + 18 + 18 = 11 + 27 + 27 = 51 + 44 - 1 = 2 + 34 + 38 = 51 + 44 + 1 = 5 × 6 ÷ 2 = 4 × 3 ÷ 4 = 4 × 8 ÷ 4 = 2 ÷ 1 × 2 = 2 × 8 ÷ 4 = 6 ÷ 1 × 8 = 5 × 1 ÷ 5 = 2 × 3 ÷ 1 =二年级上学期数学口算题(1)答案11 - 7 = 4 10 + 24 = 34 40 - 1 = 39 24 + 46 = 70 45 + 5 = 50 46 - 41 = 5 26 + 46 = 72 8 + 49 = 57 36 - 13 = 23 17 - 9 = 8 19 + 30 = 49 26 + 38 = 64 45 + 12 = 57 42 + 26 = 68 27 + 21 = 48 41 + 50 = 91 48 + 50 = 98 39 + 42 = 81 24 + 43 = 67 39 - 20 = 19 28 ÷ 4 = 7 80 ÷ 5 = 16 54 ÷ 2 = 27 24 ÷ 4 = 6 50 ÷ 5 = 10 9 × 6 = 54 7 × 7 = 49 3 × 4 = 122 × 8 = 16 7 × 2 = 14 54 ÷ 6 = 93 × 2 = 6 30 ÷ 6 = 5 8 × 6 = 48 60 ÷ 5 = 12 6 × 7 = 42 四七二十八八八六十四二八十六三三得九三五十五六八四十八四八三十二六九三十六28 + 34 - 15 = 47 28 + 34 + 15 = 77 2 + 27 + 57 = 86 5 + 18 + 18 = 41 11 + 27 + 27 = 65 51 + 44 - 1 = 94 2 + 34 + 38 = 74 51 + 44 + 1 = 96 5×6÷2=15 4×3÷4=3 4×8÷4=8 2÷1×2=4 2×8÷4=4 6÷1×8=48 5×1÷5=1 2×3÷1=6二年级上学期数学口算题(2)班级姓名成绩43 + 5 = 42 - 36 = 43 + 21 = 37 - 34 = 9 + 38 = 20 + 44 = 50 - 30 = 42 - 2 = 9 + 7 = 46 - 32 = 24 + 37 = 32 - 22 = 28 + 45 = 28 + 33 = 19 + 15 = 31 + 30 = 48 - 13 = 8 + 42 = 43 + 27 = 45 - 33 = 28 ÷ 4 = 3 × 5 = 28 ÷ 2 = 9 × 7 = 9 × 4 = 7 × 7 = 2 × 8 = 8 × 7 = 36 ÷ 2 = 16 ÷ 2 = 3 × 3 = 9 ÷ 3 = 72 ÷ 9 = 7 ÷ 7 = 26 ÷ 2 = 2 × 2 = 八九( )十二四四十( ) ( )七十四 ( )七三十五四( )三十六五六( )十六七四十( ) ( )六三十六30 + 3 + 3 = 50 - 27 + 49 = 30 - 3 + 3 = 38 + 43 - 15 = 30 + 3 - 3 = 38 + 43 + 15 = 4 + 21 + 11 = 4 + 20 + 50 = 6 ÷1 × 2 = 6 × 2 ÷ 3 = 4 × 1 ÷ 4 = 4 ÷ 1 × 2 = 9 ÷ 3 × 6 = 5 × 3 ÷ 1 = 2 ÷ 1 × 3 = 1 × 9 ÷ 3 =二年级上学期数学口算题(2)答案43 + 5 = 48 42 - 36 = 6 43 + 21 = 64 37 - 34 = 3 9 + 38 = 47 20 + 44 = 64 50 - 30 = 20 42 - 2 = 40 9 + 7 = 16 46 - 32 = 14 24 + 37 = 61 32 - 22 = 10 28 + 45 = 73 28 + 33 = 61 19 + 15 = 34 31 + 30 = 61 48 - 13 = 35 8 + 42 = 50 43 + 27 = 70 45 - 33 = 12 28 ÷ 4 = 7 3 × 5 = 15 28 ÷ 2 = 14 9 × 7 = 63 9 × 4 = 36 7 × 7 = 49 2 × 8 = 16 8 × 7 = 56 36 ÷ 2 = 18 16 ÷ 2 = 8 3 × 3 = 9 9 ÷ 3 = 372 ÷ 9 = 8 7 ÷ 7 = 1 26 ÷ 2 = 13 2 × 2 = 4 八九七十二四四十六二七十四五七三十五四九三十六五六三十六七四十二六六三十六30 + 3 + 3 = 36 50 - 27 + 49 = 72 30 - 3 + 3 = 30 38 + 43 - 15 = 66 30 + 3 - 3 = 30 38 + 43 + 15 = 96 4 + 21 + 11 = 36 4 + 20 + 50 = 74 6÷1×2=12 6×2÷3=4 4×1÷4=1 4÷1×2=8 9÷3×6=18 5×3÷1=15 2÷1×3=6 1×9÷3=3二年级上学期数学口算题(3)班级姓名成绩35 + 27 = 14 + 26 = 18 - 16 = 43 + 24 = 21 - 12 = 30 + 28 = 46 - 40 = 46 + 26 = 18 + 6 = 19 + 5 = 15 + 21 = 42 + 30 = 32 + 12 = 40 + 6 = 44 - 24 = 43 - 42 = 12 + 2 = 4 + 24 = 26 - 19 = 45 - 16 = 3 × 5 = 28 ÷ 7 = 32 ÷ 8 = 8 × 2 = 5 ÷ 5 = 78 ÷ 3 = 9 × 3 = 70 ÷ 5 = 7 × 1 = 24 ÷ 8 = 4 × 6 = 3 × 3 = 69 ÷ 3 = 48 ÷ 6 = 60 ÷ 3 = 6 × 7 = ( )八六十四 ( )二得四五( )四十 ( )六二十四( )七三十五五( )四十五二九十( ) 六( )四十二16 + 52 + 16 = 14 + 29 + 22 = 37 - 4 + 36 = 39 + 34 + 8 = 37 + 4 + 36 = 16 + 52 - 16 = 16 + 29 + 27 = 39 + 34 - 8 = 2 ÷ 1 × 6 = 4 × 6 ÷ 3 = 7 × 8 ÷ 1 = 7 × 3 ÷ 7 = 5 × 3 ÷ 5 = 3 × 5 ÷ 3 = 4 ÷ 2 × 3 = 6 × 3 ÷ 9 =二年级上学期数学口算题(3)答案35 + 27 = 62 14 + 26 = 40 18 - 16 = 2 43 + 24 = 67 21 - 12 = 9 30 + 28 = 58 46 - 40 = 6 46 + 26 = 72 18 + 6 = 24 19 + 5 = 24 15 + 21 = 36 42 + 30 = 72 32 + 12 = 44 40 + 6 = 46 44 - 24 = 20 43 - 42 = 1 12 + 2 = 14 4 + 24 = 28 26 - 19 = 7 45 - 16 = 29 3 × 5 = 15 28 ÷ 7 = 4 32 ÷ 8 = 4 8 × 2 = 16 5 ÷ 5 = 1 78 ÷ 3 = 26 9 × 3 = 27 70 ÷ 5 = 147 × 1 = 7 24 ÷ 8 = 3 4 × 6 = 24 3 × 3 = 969 ÷ 3 = 23 48 ÷ 6 = 8 60 ÷ 3 = 20 6 × 7 = 42 八八六十四二二得四五八四十四六二十四五七三十五五九四十五二九十八六七四十二16 + 52 + 16 = 84 14 + 29 + 22 = 65 37 - 4 + 36 = 69 39 + 34 + 8 = 81 37 + 4 + 36 = 77 16 + 52 - 16 = 52 16 + 29 + 27 = 72 39 + 34 - 8 = 65 2÷1×6=12 4×6÷3=8 7×8÷1=56 7×3÷7=3 5×3÷5=3 3×5÷3=5 4÷2×3=6 6×3÷9=2二年级上学期数学口算题(4)班级姓名成绩22 + 25 = 13 + 36 = 41 - 16 = 37 - 4 = 26 - 5 = 1 + 15 = 49 + 38 = 47 - 33 = 30 + 4 = 1 + 14 = 13 + 27 = 45 + 47 = 48 - 34 = 35 + 43 = 33 + 30 = 13 - 9 = 36 + 8 = 38 + 42 = 8 + 23 = 5 + 37 = 32 ÷ 4 = 65 ÷ 5 = 4 × 3 = 9 × 7 = 9 × 4 = 70 ÷ 2 = 2 × 8 = 6 × 4 = 72 ÷ 8 = 8 × 5 = 7 × 2 = 8 × 8 = 45 ÷ 3 = 50 ÷ 2 = 6 ÷ 6 = 60 ÷ 5 = 三( )二十一 ( )五二十五三( )十二 ( )七三十五七( )五十六七九( )十三五六( )十八九( )十二4 + 52 + 24 = 29 - 21 + 50 = 45 + 48 - 22 = 29 + 21 + 50 = 47 + 45 - 37 = 10 + 22 + 5 = 7 + 45 + 10 = 10 + 22 - 5 = 9 × 8 ÷6 = 5 × 4 ÷ 1 = 9 × 5 ÷ 3 = 6 ÷ 1 × 8 = 8 × 9 ÷ 6 = 3 ÷ 1 × 6 = 1 × 3 ÷ 1 = 8 ÷ 4 × 5 =二年级上学期数学口算题(4)答案22 + 25 = 47 13 + 36 = 49 41 - 16 = 25 37 - 4 = 33 26 - 5 = 21 1 + 15 = 16 49 + 38 = 87 47 - 33 = 14 30 + 4 = 34 1 + 14 = 15 13 + 27 = 40 45 + 47 = 92 48 - 34 = 14 35 + 43 = 78 33 + 30 = 63 13 - 9 = 4 36 + 8 = 44 38 + 42 = 80 8 + 23 = 31 5 + 37 = 42 32 ÷ 4 = 8 65 ÷ 5 = 13 4 × 3 = 12 9 × 7 = 639 × 4 = 36 70 ÷ 2 = 35 2 × 8 = 16 6 × 4 = 24 72 ÷ 8 = 9 8 × 5 = 40 7 × 2 = 14 8 × 8 = 6445 ÷ 3 = 15 50 ÷ 2 = 25 6 ÷ 6 = 1 60 ÷ 5 = 12 三七二十一五五二十五三四十二五七三十五七八五十六七九六十三五六三十八九七十二4 + 52 + 24 = 80 29 - 21 + 50 = 58 45 + 48 - 22 = 71 29 + 21 + 50 = 100 47 + 45 - 37 = 55 10 + 22 + 5 = 37 7 + 45 + 10 = 62 10 + 22 - 5 = 27 9×8÷6=12 5×4÷1=20 9×5÷3=15 6÷1×8=48 8×9÷6=12 3÷1×6=18 1×3÷1=3 8÷4×5=10二年级上学期数学口算题(5)班级姓名成绩31 + 7 = 21 + 21 = 33 - 27 = 36 - 9 = 7 + 12 = 47 - 40 = 2 + 50 = 17 + 10 = 45 + 23 = 40 - 31 = 34 + 49 = 9 + 20 = 4 + 45 = 40 - 8 = 46 + 15 = 21 + 28 = 25 - 14 = 30 - 20 = 14 + 20 = 14 + 41 = 30 ÷ 3 = 9 × 1 = 56 ÷ 4 = 12 ÷ 2 = 8 ÷ 4 = 21 ÷ 3 = 3 × 9 = 2 × 5 = 48 ÷ 4 = 6 × 9 = 63 ÷ 9 = 3 × 1 = 2 × 2 = 50 ÷ 2 = 5 × 5 = 3 × 8 = ( )四十六六七四十( ) ( )八四十 ( )八十六五七( )十五 ( )九二十七 ( )六二十四六九( )十六21 + 32 - 14 = 21 + 32 + 14 = 44 + 42 + 4 = 37 + 28 + 2 = 35 + 40 + 6 = 44 + 42 - 4 = 35 + 40 - 6 = 37 + 28 - 2 = 6 × 7 ÷ 1 = 4 × 2 ÷ 1 = 8 × 1 ÷ 8 = 9 ÷ 3 × 2 = 9 × 6 ÷ 3 = 6 ÷ 2 × 6 = 8 × 6 ÷ 4 = 6 × 9 ÷ 2 =二年级上学期数学口算题(5)答案31 + 7 = 38 21 + 21 = 42 33 - 27 = 6 36 - 9 = 27 7 + 12 = 19 47 - 40 = 7 2 + 50 = 52 17 + 10 = 27 45 + 23 = 68 40 - 31 = 9 34 + 49 = 83 9 + 20 = 29 4 + 45 = 49 40 - 8 = 32 46 + 15 = 61 21 + 28 = 49 25 - 14 = 11 30 - 20 = 10 14 + 20 = 34 14 + 41 = 55 30 ÷ 3 = 10 9 × 1 = 9 56 ÷ 4 = 14 12 ÷ 2 = 6 8 ÷ 4 = 2 21 ÷ 3 = 7 3 × 9 = 27 2 × 5 = 10 48 ÷ 4 = 12 6 × 9 = 54 63 ÷ 9 = 7 3 × 1 = 3 2 × 2 = 4 50 ÷ 2 = 25 5 × 5 = 25 3 × 8 = 24 四四十六六七四十二五八四十二八十六五七三十五三九二十七四六二十四六九三十六21 + 32 - 14 = 39 21 + 32 + 14 = 67 44 + 42 + 4 = 90 37 + 28 + 2 = 67 35 + 40 + 6 = 81 44 + 42 - 4 = 82 35 + 40 - 6 = 69 37 + 28 - 2 = 63 6×7÷1=42 4×2÷1=8 8×1÷8=1 9÷3×2=6 9×6÷3=18 6÷2×6=18 8×6÷4=12 6×9÷2=27二年级上学期数学口算题(6)班级姓名成绩41 + 28 = 39 + 26 = 44 - 35 = 12 + 5 = 34 - 12 = 13 - 5 = 38 - 17 = 41 + 11 = 44 + 32 = 12 + 24 = 27 + 8 = 28 + 30 = 29 - 20 = 34 - 11 = 19 + 11 = 11 + 25 = 7 + 26 = 13 + 2 = 27 + 6 = 42 - 29 = 4 × 4 = 28 ÷ 7 = 56 ÷ 7 = 65 ÷ 5 = 4 × 5 = 8× 2 = 5 × 9 = 80 ÷ 4 = 9 × 6 = 66 ÷ 6 = 3 × 9 = 80 ÷ 2 = 5 × 3 = 35 ÷ 5 = 6 × 1 = 75 ÷ 5 = 三三得( ) 三四十( ) ( )八六十四 ( )四得八三( )十五八九( )十二六( )三十六五七( )十五5 + 44 + 46 = 60 + 10 + 28 = 21 - 8 + 52 = 60 - 10 + 28 =1 + 10 + 17 = 30 - 16 + 28 = 30 + 16 + 28 = 21 + 8 + 52 =2 ÷ 1 × 6 = 6 ÷ 1 ×3 = 9 ×4 ÷ 1 = 4 × 6 ÷ 3 = 9 × 3 ÷ 9 = 1 × 6 ÷ 2 = 9 ÷ 3 × 7 = 6 × 3 ÷ 1 =二年级上学期数学口算题(6)答案41 + 28 = 69 39 + 26 = 65 44 - 35 = 9 12 + 5 = 17 34 - 12 = 22 13 - 5 = 8 38 - 17 = 21 41 + 11 = 52 44 + 32 = 76 12 + 24 = 36 27 + 8 = 35 28 + 30 = 58 29 - 20 = 9 34 - 11 = 23 19 + 11 = 30 11 + 25 = 36 7 + 26 = 33 13 + 2 = 15 27 + 6 = 33 42 - 29 = 13 4 × 4 = 16 28 ÷ 7 = 4 56 ÷ 7 = 8 65 ÷ 5 = 13 4 × 5 = 20 8 × 2 = 16 5 × 9 = 45 80 ÷ 4 = 209 × 6 = 54 66 ÷ 6 = 11 3 × 9 = 27 80 ÷ 2 = 405 × 3 = 15 35 ÷ 5 = 76 × 1 = 6 75 ÷ 5 = 15 三三得九三四十二八八六十四二四得八三五十五八九七十二六九三十六五七三十五5 + 44 + 46 = 95 60 + 10 + 28 = 98 21 - 8 + 52 = 65 60 - 10 + 28 = 78 1 + 10 + 17 = 28 30 - 16 + 28 = 42 30 + 16 + 28 = 74 21 + 8 + 52 = 81 2÷1×6=12 6÷1×3=18 9×4÷1=36 4×6÷3=8 9×3÷9=3 1×6÷2=3 9÷3×7=21 6×3÷1=18二年级上学期数学口算题(7)班级姓名成绩23 + 11 = 37 - 24 = 19 + 4 = 20 + 8 = 14 + 11 = 31 - 7 = 16 + 33 = 20 + 27 = 9 + 23 = 11 + 30 = 17 + 28 = 14 + 39 = 2 + 26 = 36 + 38 = 23 + 27 = 41 + 41 = 38 - 37 = 4 + 14 = 10 + 19 = 47 + 11 = 2 × 3 = 18 ÷ 3 = 4 × 1 = 7 × 6 = 8 × 2 = 45 ÷ 9 = 70 ÷ 2 = 8 ÷ 4 = 45 ÷ 5 = 7 × 1 = 36 ÷ 2 = 5 × 3 = 72 ÷ 9 = 3 × 6 = 8 ÷ 2 = 6 × 6 = ( )七四十二六( )三十六八八六十( ) ( )四十六( )三得六 ( )七四十九 ( )七二十一 ( )五二十五45 + 26 + 24 = 44 + 38 + 16 = 44 + 38 - 16 = 45 + 26 - 24 = 33 + 52 - 20 = 10 + 49 + 13 = 56 + 43 - 29 = 52 - 33 + 46 = 6 ÷ 1 × 9 = 7× 6 ÷ 2 = 6 ÷ 1 × 5 = 2 × 3 ÷ 2 = 9 × 5 ÷ 9 = 8 × 1 ÷ 4 = 6 ÷ 1 × 4 = 6 × 3 ÷ 1 =二年级上学期数学口算题(7)答案23 + 11 = 34 37 - 24 = 13 19 + 4 = 23 20 + 8 = 28 14 + 11 = 25 31 - 7 = 24 16 + 33 = 49 20 + 27 = 47 9 + 23 = 32 11 + 30 = 41 17 + 28 = 45 14 + 39 = 53 2 + 26 = 28 36 + 38 = 74 23 + 27 = 50 41 + 41 = 82 38 - 37 = 1 4 + 14 = 18 10 + 19 = 29 47 + 11 = 58 2 × 3 = 6 18 ÷ 3 = 6 4 × 1 = 4 7 × 6 = 428 × 2 = 16 45 ÷ 9 = 5 70 ÷ 2 = 35 8 ÷ 4 = 2 45 ÷ 5 = 9 7 × 1 = 7 36 ÷ 2 = 18 5 × 3 = 15 72 ÷ 9 = 8 3 × 6 = 18 8 ÷ 2 = 4 6 × 6 = 36 六七四十二六九三十六八八六十四四四十六二三得六七七四十九三七二十一五五二十五45 + 26 + 24 = 95 44 + 38 + 16 = 98 44 + 38 - 16 = 66 45 + 26 - 24 = 47 33 + 52 - 20 = 65 10 + 49 + 13 = 72 56 + 43 - 29 = 70 52 - 33 + 46 = 65 6÷1×9=54 7×6÷2=21 6÷1×5=30 2×3÷2=3 9×5÷9=5 8×1÷4=2 6÷1×4=24 6×3÷1=18二年级上学期数学口算题(8)班级姓名成绩44 - 42 = 48 - 47 = 3 + 13 = 34 - 24 = 2 + 38 = 26 + 16 = 1 + 10 = 46 - 2 = 40 + 48 = 49 + 40 = 3 + 22 = 38 - 13 = 5 + 26 = 50 - 33 = 21 + 8 = 13 + 22 = 12 + 19 = 42 - 15 = 4 + 26 = 37 + 40 = 72 ÷ 3 = 35 ÷ 7 = 2 × 6 = 8 ÷ 8 = 60 ÷ 2 = 70 ÷ 2 = 63 ÷ 7 = 4 × 8 = 4 × 6 = 8 × 3 = 7 ÷ 7 = 78 ÷ 2 = 3 × 2 = 18 ÷ 2 = 9 × 1 = 5 × 5 = 四八三十( ) 五九( )十五四五( )十二( )十六( )七三十五八九七十( ) ( )六三十 ( )六十二18 + 39 + 27 = 28 + 11 + 33 = 41 + 12 - 2 = 3 + 2 + 25 = 3 - 2 + 25 = 28 - 11 + 33 = 44 + 14 + 17 = 41 + 12 + 2 = 9 ÷ 1 × 9 = 7 × 2 ÷ 1 = 8 × 3 ÷ 2 = 1 × 9 ÷ 1 = 4 ÷ 2 × 6 = 9 × 4 ÷ 9 = 2 × 1 ÷ 2 = 6 × 3 ÷ 1 =二年级上学期数学口算题(8)答案44 - 42 = 2 48 - 47 = 1 3 + 13 = 16 34 - 24 = 10 2 + 38 = 40 26 + 16 = 42 1 + 10 = 11 46 - 2 = 44 40 + 48 = 88 49 + 40 = 89 3 + 22 = 25 38 - 13 = 25 5 + 26 = 31 50 - 33 = 17 21 + 8 = 29 13 + 22 = 35 12 + 19 = 31 42 - 15 = 27 4 + 26 = 30 37 + 40 = 77 72 ÷ 3 = 24 35 ÷ 7 = 5 2 × 6 = 12 8 ÷ 8 = 1 60 ÷ 2 = 30 70 ÷ 2 = 35 63 ÷ 7 = 9 4 × 8 = 32 4 × 6 = 24 8 × 3 = 24 7 ÷ 7 = 1 78 ÷ 2 = 393 × 2 = 6 18 ÷ 2 = 9 9 × 1 = 9 5 × 5 = 25 四八三十二五九四十五四五二十二八十六五七三十五八九七十二五六三十二六十二18 + 39 + 27 = 84 28 + 11 + 33 = 72 41 + 12 - 2 = 51 3 + 2 + 25 = 30 3 - 2 + 25 = 26 28 - 11 + 33 = 50 44 + 14 + 17 = 75 41 + 12 + 2 = 55 9÷1×9=81 7×2÷1=14 8×3÷2=12 1×9÷1=9 4÷2×6=12 9×4÷9=4 2×1÷2=1 6×3÷1=18二年级上学期数学口算题(9)班级姓名成绩44 + 17 = 27 - 13 = 33 + 10 = 47 + 48 = 20 + 8 = 49 - 18 = 29 + 14 = 34 - 30 = 31 + 19 = 45 - 17 = 7 + 4 = 19 - 15 = 1 + 48 = 44 - 41 = 17 + 23 = 11 + 15 = 7 + 7 = 40 - 28 = 45 - 16 = 33 + 5 = 2 × 9 = 4 × 1 = 6 ÷ 2 = 7 × 6 = 12 ÷ 3 = 9 × 9 = 8 × 7 = 62 ÷ 2 = 4 × 6 = 2 × 7 = 64 ÷ 2 = 4 × 2 = 30 ÷ 6 = 60 ÷ 6 = 50 ÷ 2 = 6 × 6 = 五( )四十二( )十四五六( )十 ( )七二十一( )九四十五三( )十二 ( )六二十四六( )三十六43 + 2 + 7 = 15 + 24 + 35 = 59 - 14 + 40 = 35 - 26 + 59 = 10 + 25 + 1 = 13 + 41 + 30 = 5 + 40 + 12 = 43 - 2 + 7 = 8 ÷ 1 × 3 = 7 × 3 ÷ 1 = 6 × 1 ÷ 6 = 2 × 9 ÷ 2 = 5 × 7 ÷ 5 = 6 × 5 ÷ 1 = 6 × 9 ÷ 3 = 3 × 8 ÷ 6 =二年级上学期数学口算题(9)答案44 + 17 = 61 27 - 13 = 14 33 + 10 = 43 47 + 48 = 95 20 + 8 = 28 49 - 18 = 31 29 + 14 = 43 34 - 30 = 4 31 + 19 = 50 45 - 17 = 28 7 + 4 = 11 19 - 15 = 4 1 + 48 = 49 44 - 41 = 3 17 + 23 = 40 11 + 15 = 26 7 + 7 = 14 40 - 28 = 12 45 - 16 = 29 33 + 5 = 38 2 × 9 = 18 4 × 1 = 4 6 ÷ 2 = 3 7 × 6 = 42 12 ÷ 3 = 4 9 × 9 = 81 8 × 7 = 56 62 ÷ 2 = 314 × 6 = 24 2 × 7 = 14 64 ÷ 2 = 32 4 × 2 = 830 ÷ 6 = 5 60 ÷ 6 = 10 50 ÷ 2 = 25 6 × 6 = 36 五八四十二七十四五六三十三七二十一五九四十五三四十二四六二十四六九三十六43 + 2 + 7 = 52 15 + 24 + 35 = 74 59 - 14 + 40 = 85 35 - 26 + 59 = 68 10 + 25 + 1 = 36 13 + 41 + 30 = 84 5 + 40 + 12 = 57 43 - 2 + 7 = 48 8÷1×3=24 7×3÷1=21 6×1÷6=1 2×9÷2=9 5×7÷5=7 6×5÷1=30 6×9÷3=18 3×8÷6=4二年级上学期数学口算题(10)班级姓名成绩25 - 20 = 43 + 24 = 32 + 32 = 42 - 3 =40 + 1 = 40 + 18 = 15 - 13 = 42 + 45 =41 + 13 = 31 - 3 = 27 + 30 = 31 - 22 = 32 + 10 = 17 - 1 = 3 + 22 = 46 + 1 = 31 - 20 = 38 + 8 = 8 + 7 = 38 - 19 = 40 ÷ 4 = 4 × 4 = 65 ÷ 5 = 2 × 9 = 4 × 7 = 2 × 6 = 56 ÷ 4 = 35 ÷ 7 = 9 × 3 = 70 ÷ 2 = 42 ÷ 2 = 3 × 4 = 16 ÷ 2 = 2 × 1 = 58 ÷ 2 = 3 × 2 = 二( )十四三( )十五 ( )二得四 ( )六十二二九十( ) ( )六二十四四九三十( ) ( )五二十49 + 37 + 9 = 8 + 27 + 59 = 26 + 28 - 21 = 49 + 37 - 9 = 19 + 55 - 2 = 19 + 55 + 2 = 38 - 19 + 45 = 26 + 28 + 21 =4 × 7 ÷ 4 = 9 ÷ 3 × 1 = 9 × 2 ÷ 6 = 6 × 1 ÷ 3 =5 × 3 ÷ 5 = 1 × 9 ÷ 1 = 9 ÷ 3 × 2 =6 × 9 ÷ 2 =二年级上学期数学口算题(10)答案25 - 20 = 5 43 + 24 = 67 32 + 32 = 64 42 - 3 = 3940 + 1 = 41 40 + 18 = 58 15 - 13 = 2 42 + 45 = 8741 + 13 = 54 31 - 3 = 28 27 + 30 = 57 31 - 22 = 9 32 + 10 = 42 17 - 1 = 16 3 + 22 = 25 46 + 1 = 47 31 - 20 = 11 38 + 8 = 46 8 + 7 = 15 38 - 19 = 19 40 ÷ 4 = 10 4 × 4 = 16 65 ÷ 5 = 13 2 × 9 = 18 4 × 7 = 28 2 × 6 = 12 56 ÷ 4 = 14 35 ÷ 7 = 5 9 × 3 = 27 70 ÷ 2 = 35 42 ÷ 2 = 21 3 × 4 = 12 16 ÷ 2 = 8 2 × 1 = 2 58 ÷ 2 = 29 3 × 2 = 6 二七十四三五十五二二得四二六十二二九十八四六二十四四九三十六四五二十49 + 37 + 9 = 95 8 + 27 + 59 = 94 26 + 28 - 21 = 33 49 + 37 - 9 = 77 19 + 55 - 2 = 72 19 + 55 + 2 = 76 38 - 19 + 45 = 64 26 + 28 + 21 = 75 4×7÷4=7 9÷3×1=3 9×2÷6=3 6×1÷3=2 5×3÷5=3 1×9÷1=9 9÷3×2=6 6×9÷2=27二年级上学期数学口算题(11)班级姓名成绩7 + 10 = 28 + 13 = 11 + 22 = 11 - 3 = 28 - 24 = 46 + 25 = 34 + 19 = 35 + 40 = 14 + 37 = 47 + 28 = 15 + 15 = 12 + 13 = 41 - 5 = 22 + 46 = 46 + 29 = 44 + 34 = 39 + 17 = 42 - 39 = 9 + 31 = 50 + 23 = 60 ÷ 4 = 2 × 3 = 6 × 2 = 4 × 3 = 72 ÷ 4 = 2 × 6 = 8 × 2 = 49 ÷ 7 = 55 ÷ 5 = 9 × 6 = 7 × 6 = 8 × 8 = 78 ÷ 2 = 54 ÷ 9 = 7 ÷ 7 = 60 ÷ 3 = 二( )十四五六( )十八九( )十二九九( )十一六七四十( ) ( )六三十六三八( )十四二( )十六23 + 36 + 17 = 10 + 24 + 39 = 22 - 3 + 34 = 23 + 36 - 17 = 21 + 36 + 30 = 55 + 23 - 7 = 55 + 23 + 7 = 22 + 3 + 34 = 2 × 3 ÷ 2 = 1 × 4 ÷ 1 = 1 × 6 ÷ 2 = 4 × 9 ÷ 1 = 8 × 7 ÷ 1 = 7 × 4 ÷ 2 = 8 ÷ 2 × 4 = 4 × 8 ÷ 1 =二年级上学期数学口算题(11)答案7 + 10 = 17 28 + 13 = 41 11 + 22 = 33 11 - 3 = 8 28 - 24 = 4 46 + 25 = 71 34 + 19 = 53 35 + 40 = 75 14 + 37 = 51 47 + 28 = 75 15 + 15 = 30 12 + 13 = 25 41 - 5 = 36 22 + 46 = 68 46 + 29 = 75 44 + 34 = 78 39 + 17 = 56 42 - 39 = 3 9 + 31 = 40 50 + 23 = 73 60 ÷ 4 = 15 2 × 3 = 6 6 × 2 = 12 4 × 3 = 12 72 ÷ 4 = 18 2 × 6 = 12 8 × 2 = 16 49 ÷ 7 = 7 55 ÷ 5 = 11 9 × 6 = 54 7 × 6 = 42 8 × 8 = 6478 ÷ 2 = 39 54 ÷ 9 = 6 7 ÷ 7 = 1 60 ÷ 3 = 20 二七十四五六三十八九七十二九九八十一六七四十二六六三十六三八二十四二八十六23 + 36 + 17 = 76 10 + 24 + 39 = 73 22 - 3 + 34 = 53 23 + 36 - 17 = 42 21 + 36 + 30 = 87 55 + 23 - 7 = 71 55 + 23 + 7 = 85 22 + 3 + 34 = 59 2×3÷2=3 1×4÷1=4 1×6÷2=3 4×9÷1=36 8×7÷1=56 7×4÷2=14 8÷2×4=16 4×8÷1=32二年级上学期数学口算题(12)班级姓名成绩47 + 47 = 50 + 10 = 15 + 19 = 19 + 50 = 25 + 15 = 48 - 41 = 3 + 27 = 45 + 26 = 2 - 1 = 22 + 16 = 35 - 21 = 31 + 38 = 42 + 49 = 43 - 29 = 40 + 6 = 12 - 2 = 22 - 21 = 31 + 35 = 30 + 27 = 27 + 21 = 4 × 4 = 4 × 7 = 80 ÷ 4 = 49 ÷ 7 = 9 × 4 = 5 × 1 = 70 ÷ 5 = 3 × 7 = 45 ÷ 5 = 39 ÷ 3 = 54 ÷ 3 = 2 × 7 = 5 × 2 = 5 × 7 = 24 ÷ 4 = 42 ÷ 6 = ( )九三十六三( )十五四六( )十四 ( )六三十六( )七四十九三( )十八二五( )十三八( )十四24 - 7 + 10 = 24 + 7 + 10 = 37 - 15 + 28 = 21 + 21 + 31 = 16 + 41 + 21 = 51 - 17 + 34 = 37 + 15 + 28 = 21 - 21 + 31 =5 × 8 ÷ 4 = 2 ÷ 1 × 5 = 8 × 1 ÷ 4 = 4 × 1 ÷ 4 =6 ÷ 2 ×7 = 5 ÷ 1 × 2 = 5 × 2 ÷ 5 = 6 ÷ 3 × 1 =二年级上学期数学口算题(12)答案47 + 47 = 94 50 + 10 = 60 15 + 19 = 34 19 + 50 = 69 25 + 15 = 40 48 - 41 = 7 3 + 27 = 30 45 + 26 = 71 2 - 1 = 1 22 + 16 = 38 35 - 21 = 14 31 + 38 = 69 42 + 49 = 91 43 - 29 = 14 40 + 6 = 46 12 - 2 = 10 22 - 21 = 1 31 + 35 = 66 30 + 27 = 57 27 + 21 = 48 4 × 4 = 16 4 × 7 = 28 80 ÷ 4 = 20 49 ÷ 7 = 7 9 × 4 = 36 5 × 1 = 5 70 ÷ 5 = 14 3 × 7 = 21 45 ÷ 5 = 9 39 ÷ 3 = 13 54 ÷ 3 = 18 2 × 7 = 14 5 × 2 = 10 5 × 7 = 35 24 ÷ 4 = 6 42 ÷ 6 = 7 六九三十六三五十五四六二十四六六三十六七七四十九三六十八二五一十三八二十四24 - 7 + 10 = 27 24 + 7 + 10 = 41 37 - 15 + 28 = 50 21 + 21 + 31 = 73 16 + 41 + 21 = 78 51 - 17 + 34 = 68 37 + 15 + 28 = 80 21 - 21 + 31 = 31 5×8÷4=10 2÷1×5=10 8×1÷4=2 4×1÷4=1 6÷2×7=21 5÷1×2=10 5×2÷5=2 6÷3×1=2二年级上学期数学口算题(13)班级姓名成绩30 - 26 = 2 + 39 = 49 + 12 = 43 + 43 = 45 + 8 = 36 + 32 = 21 + 13 = 41 + 7 = 43 - 35 = 31 - 3 = 17 - 15 = 47 + 31 = 47 + 14 = 7 - 2 = 50 - 24 = 1 + 1 = 31 - 29 = 33 - 10 = 17 + 29 = 48 + 2 = 4 × 1 = 20 ÷ 4 = 12 ÷ 2 = 9 × 8 = 16 ÷ 8 = 2 × 8 = 2 × 2 = 8 × 5 = 80 ÷ 2 = 27 ÷ 3 = 5 × 2 = 56 ÷ 2 = 54 ÷ 9 = 6 × 1 = 8 × 6 = 42 ÷ 6 = 七七( )十九三七二十( ) 七八( )十六 ( )二得四( )五二十二三得( ) 四七( )十八四( )三十二36 - 34 + 41 = 19 - 9 + 41 = 19 + 9 + 41 = 39 - 25 + 52 = 40 - 14 + 60 = 23 + 21 + 7 = 36 - 34 + 43 = 23 + 21 - 7 = 6 × 9 ÷ 1 = 4 ×7 ÷ 2 = 9 × 3 ÷ 9 = 6 ÷ 2 × 3 = 8 ÷ 4 × 8 = 6 × 7 ÷ 2 = 3 × 8 ÷ 6 = 4 × 9 ÷ 4 =二年级上学期数学口算题(13)答案30 - 26 = 4 2 + 39 = 41 49 + 12 = 61 43 + 43 = 86 45 + 8 = 53 36 + 32 = 68 21 + 13 = 34 41 + 7 = 48 43 - 35 = 8 31 - 3 = 28 17 - 15 = 2 47 + 31 = 78 47 + 14 = 61 7 - 2 = 5 50 - 24 = 26 1 + 1 = 2 31 - 29 = 2 33 - 10 = 23 17 + 29 = 46 48 + 2 = 50 4 × 1 = 4 20 ÷ 4 = 5 12 ÷ 2 = 6 9 × 8 = 72 16 ÷ 8 = 2 2 × 8 = 16 2 × 2 = 4 8 × 5 = 40 80 ÷ 2 = 40 27 ÷ 3 = 9 5 × 2 = 10 56 ÷ 2 = 28 54 ÷ 9 = 6 6 × 1 = 6 8 × 6 = 48 42 ÷ 6 = 7 七七四十九三七二十一七八五十六二二得四四五二十二三得六四七二十八四八三十二36 - 34 + 41 = 43 19 - 9 + 41 = 51 19 + 9 + 41 = 69 39 - 25 + 52 = 66 40 - 14 + 60 = 86 23 + 21 + 7 = 51 36 - 34 + 43 = 45 23 + 21 - 7 = 37 6×9÷1=54 4×7÷2=14 9×3÷9=3 6÷2×3=9 8÷4×8=16 6×7÷2=21 3×8÷6=4 4×9÷4=9二年级上学期数学口算题(14)班级姓名成绩47 - 6 = 42 + 10 = 39 - 3 = 19 + 28 = 2 + 50 = 10 + 8 = 4 + 31 = 27 + 39 = 38 - 2 = 43 + 47 = 30 + 11 = 47 - 43 = 10 + 4 = 10 + 44 = 38 + 41 = 15 + 38 = 49 - 23 = 29 - 22 = 27 + 31 = 8 + 42 = 68 ÷ 4 = 28 ÷ 4 = 4 × 3 = 9 × 3 = 7 × 7 = 5 × 1 = 66 ÷ 2 = 5 × 8 = 51 ÷ 3 = 48 ÷ 3 = 4 × 2 = 48 ÷ 6 = 7 × 2 = 27 ÷ 3 = 6 × 5 = 10 ÷ 5 = ( )四十六 ( )九七十二六八( )十八 ( )八三十二二二得( ) ( )四得八 ( )八十六 ( )八四十4 + 27 + 13 = 2 + 23 + 53 = 25 + 3 + 26 = 25 - 3 + 26 = 50 + 37 - 18 = 11 + 3 + 23 = 57 -9 + 38 = 11 - 3 + 23 = 9 × 3 ÷ 1 = 9 ÷ 1 × 9 = 4 × 2 ÷ 4 = 4 × 9 ÷ 2 = 4 ÷ 1 × 5 = 9 ÷ 3 × 2 = 9 × 4 ÷ 9 = 4 ÷ 2 × 5 =二年级上学期数学口算题(14)答案47 - 6 = 41 42 + 10 = 52 39 - 3 = 36 19 + 28 = 47 2 + 50 = 52 10 + 8 = 18 4 + 31 = 35 27 + 39 = 66 38 - 2 = 36 43 + 47 = 90 30 + 11 = 41 47 - 43 = 4 10 + 4 = 14 10 + 44 = 54 38 + 41 = 79 15 + 38 = 53 49 - 23 = 26 29 - 22 = 7 27 + 31 = 58 8 + 42 = 50 68 ÷ 4 = 17 28 ÷ 4 = 7 4 × 3 = 12 9 × 3 = 277 × 7 = 49 5 × 1 = 5 66 ÷ 2 = 33 5 × 8 = 40 51 ÷ 3 = 17 48 ÷ 3 = 16 4 × 2 = 8 48 ÷ 6 = 87 × 2 = 14 27 ÷ 3 =9 6 × 5 = 30 10 ÷ 5 = 2 四四十六八九七十二六八四十八四八三十二二二得四二四得八二八十六五八四十4 + 27 + 13 = 44 2 + 23 + 53 = 78 25 + 3 + 26 = 54 25 - 3 + 26 = 48 50 + 37 - 18 = 69 11 + 3 + 23 = 37 57 - 9 + 38 = 86 11 - 3 + 23 = 31 9×3÷1=27 9÷1×9=81 4×2÷4=2 4×9÷2=18 4÷1×5=20 9÷3×2=6 9×4÷9=4 4÷2×5=10二年级上学期数学口算题(15)班级姓名成绩8 + 8 = 30 + 49 = 22 + 10 = 30 - 26 =24 - 12 = 46 + 22 = 41 + 39 = 47 - 25 =24 - 16 = 10 + 42 = 46 + 31 = 40 - 30 =6 + 10 = 41 + 31 = 29 + 16 = 50 - 24 =50 - 33 = 46 - 27 = 22 + 17 = 9 + 10 =40 ÷ 4 = 60 ÷ 4 = 6 × 2 = 80 ÷ 4 =4 × 1 = 56 ÷ 4 = 45 ÷ 9 = 76 ÷ 4 =2 × 4 = 8 ÷ 4 = 8 × 9 =3 × 9 =56 ÷ 2 = 3 × 2 = 5 × 7 = 6 × 7 = ( )九十八七( )五十六七九六十( ) 四四十( ) ( )五一十五( )四十五三( )十二五( )四十35 + 22 + 3 = 7 + 27 + 15 = 13 + 25 + 39 = 5 + 46 + 22 =21 + 50 - 1 = 21 + 50 + 1 = 1 + 10 + 4 = 35 + 22 - 3 =8 ÷ 1 × 3 = 8 × 3 ÷ 8 = 7 × 8 ÷ 4 = 2 × 3 ÷ 6 =6 ÷ 3 × 6 = 3 × 8 ÷ 4 = 8 ÷ 2 × 6 = 8 ÷ 2 × 9 =二年级上学期数学口算题(15)答案8 + 8 = 16 30 + 49 = 79 22 + 10 = 32 30 - 26 = 4 24 - 12 = 12 46 + 22 = 68 41 + 39 = 80 47 - 25 = 22 24 - 16 = 8 10 + 42 = 52 46 + 31 = 77 40 - 30 = 10 6 + 10 = 16 41 + 31 = 72 29 + 16 = 45 50 - 24 = 26 50 - 33 = 17 46 - 27 = 19 22 + 17 = 39 9 + 10 = 19 40 ÷ 4 = 10 60 ÷ 4 = 15 6 × 2 = 12 80 ÷ 4 = 204 × 1 = 4 56 ÷ 4 = 14 45 ÷ 9 = 5 76 ÷ 4 = 19 2 × 4 = 8 8 ÷ 4 = 2 8 × 9 = 72 3 × 9 = 27 56 ÷ 2 =28 3 × 2 = 6 5 × 7 = 35 6 × 7 = 42 二九十八七八五十六七九六十三四四十六二五一十五九四十五三四十二五八四十35 + 22 + 3 = 60 7 + 27 + 15 = 49 13 + 25 + 39 = 77 5 + 46 + 22 = 73 21 + 50 - 1 = 70 21 + 50 + 1 = 72 1 + 10 + 4 = 15 35 + 22 - 3 = 54 8÷1×3=24 8×3÷8=3 7×8÷4=14 2×3÷6=1 6÷3×6=12 3×8÷4=6 8÷2×6=24 8÷2×9=36二年级上学期数学口算题(16)班级姓名成绩47 + 33 = 24 + 7 = 5 + 3 = 12 + 33 = 30 + 28 = 46 - 14 = 6 + 4 = 45 - 20 = 25 - 9 = 20 + 36 = 49 + 16 = 30 + 11 = 11 + 27 = 22 + 37 = 23 + 7 = 18 + 17 = 44 - 27 = 25 - 14 = 49 - 26 = 42 + 7 = 4 × 7 = 77 ÷ 7 = 32 ÷ 8 = 36 ÷ 4 = 56 ÷ 7 = 4 × 5 = 9 × 2 = 12 ÷ 3 = 51 ÷ 3 = 7 × 4 = 2 × 8 = 2 × 5 = 30 ÷ 5 = 30 ÷ 6 = 6 × 6 = 60 ÷ 5 = 六( )四十八 ( )七四十九三九二十( ) 三( )十五( )六十八 ( )八三十二八九七十( ) 八八( )十四6 + 12 + 26 = 14 + 28 + 25 = 26 - 13 + 21 = 17 + 22 + 23 = 26 + 13 + 21 = 48 + 34 + 5 = 11 + 36 + 33 = 48 + 34 - 5 =9 ÷ 1 × 4 = 2 ÷ 1× 2 = 4 × 9 ÷ 3 = 9 × 6 ÷ 2 = 2 × 8 ÷ 1 = 6 × 9 ÷ 3 = 2 ÷ 1 × 3 = 6 × 3 ÷ 1 =二年级上学期数学口算题(16)答案47 + 33 = 80 24 + 7 = 31 5 + 3 = 8 12 + 33 = 45 30 + 28 = 58 46 - 14 = 32 6 + 4 = 10 45 - 20 = 25 25 - 9 = 16 20 + 36 = 56 49 + 16 = 65 30 + 11 = 41 11 + 27 = 38 22 + 37 = 59 23 + 7 = 30 18 + 17 = 35 44 - 27 = 17 25 - 14 = 11 49 - 26 = 23 42 + 7 = 49 4 × 7 = 28 77 ÷ 7 = 11 32 ÷ 8 = 4 36 ÷ 4 = 9 56 ÷ 7 = 8 4 × 5 = 20 9 × 2 = 18 12 ÷ 3 = 4 51 ÷ 3 = 17 7 × 4 = 28 2 × 8 = 16 2 × 5 = 10 30 ÷ 5 = 6 30 ÷ 6 = 5 6 × 6 = 36 60 ÷ 5 = 12 六八四十八七七四十九三九二十七三五十五三六十八四八三十二八九七十二八八六十四6 + 12 + 26 = 44 14 + 28 + 25 = 67 26 - 13 + 21 = 34 17 + 22 + 23 = 62 26 + 13 + 21 = 60 48 + 34 + 5 = 87 11 + 36 + 33 = 80 48 + 34 - 5 = 77 9÷1×4=36 2÷1×2=4 4×9÷3=12 9×6÷2=27 2×8÷1=16 6×9÷3=18 2÷1×3=6 6×3÷1=18二年级上学期数学口算题(17)班级姓名成绩41 + 36 = 35 + 30 = 49 - 12 = 38 - 10 =13 - 5 = 18 + 22 = 32 - 18 = 14 + 48 =2 + 11 = 12 + 20 = 10 + 6 = 46 - 25 =21 + 23 = 28 - 8 = 46 + 33 = 17 + 23 =37 + 34 = 47 - 2 = 29 + 28 = 6 + 41 =2 × 9 = 50 ÷ 5 = 9 ×3 = 9 × 7 =15 ÷ 3 = 20 ÷ 5 = 21 ÷ 3 = 16 ÷ 2 =34 ÷ 2 = 4 × 2 = 3 × 3 = 2 × 5 =72 ÷ 9 = 78 ÷ 2 = 48 ÷ 4 = 5 × 2 =二九十( ) ( )八六十四 ( )五二十七八( )十六三四十( ) 四九三十( ) 二八十( ) 九九八十( ) 28 - 22 + 22 = 25 + 29 - 20 = 51 - 34 + 36 = 28 + 22 + 22 =53 - 12 + 41 = 3 + 6 + 6 = 28 + 22 - 22 = 25 + 29 + 20 =3 × 8 ÷ 1 = 5 ×4 ÷ 1 = 2 × 7 ÷ 2 = 6 × 7 ÷ 2 =4 ÷ 1 × 6 = 8 ÷ 4 × 2 = 6 × 4 ÷ 3 = 6 × 3 ÷ 1 =二年级上学期数学口算题(17)答案41 + 36 = 77 35 + 30 = 65 49 - 12 = 37 38 - 10 = 28 13 - 5 = 8 18 + 22 = 40 32 - 18 = 14 14 + 48 = 62 2 + 11 = 13 12 + 20 = 32 10 + 6 = 16 46 - 25 = 21 21 + 23 = 44 28 - 8 = 20 46 + 33 = 79 17 + 23 = 40 37 + 34 = 71 47 - 2 = 45 29 + 28 = 57 6 + 41 = 47 2 × 9 = 18 50 ÷ 5 = 10 9 × 3 = 27 9 × 7 = 63 15 ÷ 3 = 5 20 ÷ 5 = 4 21 ÷ 3 = 7 16 ÷ 2 = 8 34 ÷ 2 = 17 4 × 2 = 8 3 × 3 = 9 2 × 5 = 10 72 ÷ 9 = 8 78 ÷ 2 = 39 48 ÷ 4 = 12 5 × 2 = 10 二九十八八八六十四四五二十七八五十六三四十二四九三十六二八十六九九八十一28 - 22 + 22 = 28 25 + 29 - 20 = 34 51 - 34 + 36 = 53 28 + 22 + 22 = 72 53 - 12 + 41 = 82 3 + 6 + 6 = 15 28 + 22 - 22 = 28 25 + 29 + 20 = 74 3×8÷1=24 5×4÷1=20 2×7÷2=7 6×7÷2=21 4÷1×6=24 8÷4×2=4 6×4÷3=8 6×3÷1=18。

七年级下册数学题库试卷

七年级下册数学题库试卷

选择题
下列哪个数是有理数?
A. √2
B. π
C. 3/4(正确答案)
D. e
下列哪个选项是方程2x - 5 = 7 的解?
A. x = 2
B. x = 6(正确答案)
C. x = -1
D. x = 0
下列哪个图形不是轴对称图形?
A. 等腰三角形
B. 正方形
C. 平行四边形(正确答案)
D. 圆
下列哪个选项表示的是一组对边平行且相等的四边形?
A. 矩形
B. 菱形
C. 平行四边形(正确答案)
D. 梯形
下列哪个数集是无限集?
A. {1, 2, 3}
B. {x | x 是小于10 的正整数}
C. {x | x 是方程x2 - 4 = 0 的解}
D. {x | x 是自然数}(正确答案)
下列哪个选项是函数y = 3x + 2 与y = -x + 4 的交点的横坐标?
A. 1/2(正确答案)
B. 1
C. 2
D. 3
下列哪个选项是不等式2x - 1 > 5 的解集?
A. x > 2
B. x > 3(正确答案)
C. x < 2
D. x < 3
下列哪个选项是点(1, 2) 到直线y = x + 1 的垂直距离?
A. √2/2(正确答案)
B. √2
C. 2
D. 2√2
下列哪个选项是多项式2x2 - 3x + 1 的次数?
A. 1
B. 2(正确答案)
C. 3
D. 4。

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