简便计算五年级及答案
五年级数学简便计算含解析答案
简便计算2练习题例1 ÷÷4解析:运用除法的性质:a÷b÷c=a÷b×c使计算简便;答案:÷÷4=÷×4=÷1=例2 ×98+解析:动态线条将分成×2答案:×98+=×98+×2=×98+2=×100=1560小结:小数的计算中,我们可以运用乘法分配律,进行简便计算;但是这一题我们一开始看不出相同的数,但是发现正好可以换成2个,即×2,下面再利用乘法分配律进行简便计算就可以了;例3×+×+×101解析:、、在×,变为×在×101,变为×答案:×+×+×101=×+×+×=×++=×100=435小结:这是一道多积求和的题目,在三个积里,我们可以运用积不变的规律使其统一,这样就可以顺利解决了;例4÷××26÷解析:÷和×26;×和÷改变运算顺序可以使计算简便;同时将×26挪到÷前面加两个括号答案:÷××26÷=×26÷×÷=×100×10=50300例5÷+÷+÷+÷解析:所有的÷几个除数都是,可以先把几个被除数相加,所得的和再除以即可;答案:÷+÷+÷+÷=+++÷=8÷=10。
五年级上册数学简便计算30道题及答案
五年级上册数学简便计算30道题及答案1、24.6-3.98+5.4-6.02解析:此题利用加法交换结合律,凑整再计算。
步骤如下:24.6-3.98+5.4-6.02=(24.6+5.4)-(3.98+6.02)=30-10=202、27×17/26解析:此题先用加法分配律,把27转换成(26+1),再利用乘法结合律,使得运算简便。
27×17/26=(26+1)×17/26=26×17/26+1×17/26=17+17/26=17又17/263、528-99解析:利用凑整法和减法结合律计算,先利用凑整法把99变换为(100-1),再运用a-b-c=a-(b+c)来简便计算,步骤如下:528-99=528-(100-1)=528-100+1=428+1=4294、1.2×2.5+0.8×2.5解析:运用提取公因数的方法,公式:ac+ab=a(b+c),提取公因数2.5,1.2和0.8相加正好凑整数,使得运算简便。
1.2×2.5+0.8×2.5=(1.2+0.8)×2.5=2×2.5=55、2.96×40解析:此题先利用乘法分配律,把2.96×40转换成29.6x4,再利用乘法结合律来简便计算。
2.96×40=29.6x4=(30-0.4)x4=30×4+0.4×4=120-1.6=118.46、0.36 x 1.5 - 0.45解析:此题运用乘法分配律,把0.45转换成1.5 x 0.3 ,即可提取公因数1.5,再根据乘法结合律进行简便计算。
0.36 x 1.5 - 0.45= 0.36 x 1.5 - 1.5 x 0.3= 1.5 × (0.36 - 0.3)= 1.5 × 0.06= 0.097、46×44/45解析:此题先利用加法分配律把46转换成(45+1),再利用乘法结合律:(a×b)×c=a×(b×c)使得运算简便。
五年级简便运算500道及答案
五年级简便运算500道及答案五年级上册简算题100道带答案0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=10001.25×(8+10)=1.25×8+1.25×10=10+12.5=22.59123-(123+8.8)=9123-123-8.8=9000-8.8=8991.21.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.99999×1001=9999×(1000+1)=9999×1000+9999×1=14.8×6.3-6.3×6.5+8.3×3.7 =(14.8-6.5)×6.3+8.3×3.7 =8.3×6.3+8.3×3.78.3×(6.3+3.7)=8.3×10=831.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78933-157-43=933-(157+43)=933-200=7334821-998=4821-1000+2=3823I32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=1000009048÷268=(2600+2600+2600+1248)÷26=2600÷26+2600÷26+2600÷26+1248÷269 =100+100+100+48=3482881÷ 43=(1290+1591)÷ 434=1290÷43+1591÷43=30+373.2×42.3×3.75-12.5×0.423×16=3.2×42.3×3.75-1.25×42.3×1.6=42.3×(3.2×3.75-1.25×1.6)=42.3×(4×0.8×3.75-1.25×4×0.4)=42.3×(4×0.4×2×3.75-1.25×4×0.4) =42.3×(4x0.4x7.5-1.25x4x0.4)=42.3×[4×0.4×(7.5-1.25)]=42.3×[4×0.4×6.25]=42.3×(4×2.5)=42371.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.656.5×8+3.5×8-47=52+28-47=80-47(80-9.8)×5分之2-1.32=70.2X2/5-1.32=28.08-1.32=26.768×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25]=8×4/7÷4=8/72700×(506-499)÷900=2700×7÷900=18900÷900=2133.02-(148.4-90.85)÷2.5 =33.02-57.55÷2.5=33.02-23.02=10(1÷1-1)÷5.1=(1-1)÷5.1=0÷5.1=018.1+(3-0.299÷0.23)×1=18.1+1.7×1=18.1+1.7=19.8五年级上册简便算法题10÷3.14-6.86÷3.1437.68÷0.25÷43.75-(2.75-1.3)37.56-(18+7.56) 0.77÷144.5×9.80.7÷0.1250.7÷0.252.5×3.2×12.512.5×9.6×0.253.75-(2.8-1.25)37.65÷0.4÷0.253.125÷8÷0.12537.65-4.75-3.2525×6.4×12.53.6×0.25答案10÷3.14-6.86÷3.14 =(10-6.86)÷3.14 =3.14÷3.14 =137.68÷0.25÷4 =37.68÷(0.25×4) =37.68÷1 =37.683.75-(2.75-1.3) =3.75-2.75+1.3 =1+1.3 =2.337.56-(18+7.56) =37.56-7.56-18 =30-18 =12 0.77÷14 =0.77÷7÷2 =0.11÷2 =0.055 4.5×9.8=4.5×(10-0.2) =4.5×10-4.5×0.2 =45-0.9 =44.1 0.7÷0.125=(0.7×8)÷(0.125×8) =0.56÷1 =0.56 0.7÷0.25=(0.7×4)÷(0.25×4) =2.8÷1 =2.82.5×3.2×12.5 =(2.5×0.4)×(8×12.5) =1×100 =10012.5×9.6×0.25=(12.5×0.8)×3×(4×0.25) =10×3×1 =303.75-(2.8-1.25) =3.75+1.25-2.8=5-2.8 =2.237.65÷0.4÷0.25 3.125÷8÷0.125 37.65-4.75-3.25 25×6.4×12.5 =25×4×0.2×8×12.5 3.6×0.25 =(4-0.4)×0.25 3.4÷9+5.6÷9 =五年级上册100道乘法简便计算含答案用简便方法计算.1、368+2649+13512、 87+101+1133、24+127+476+5734、400-273-1275、327+(96-127)6、72×987、999+99+9 8、442-103-1429、67×5×2 10、25×(78×4)11、72×125 12、9000÷125÷813、400÷25 14、25×3615、103×27 16、76×10217、3600÷25÷4 18、99×3519、(25+12)×4 20、56×27+27×4421、56×99+56 22、125×25×8×423、25×32×125 24、125×64(1)(78+61)+39 (2)700-82-18(3)348+163+242+410+537(4)125×47-47×25(5)201×316(6)374-205+226-95(7)3000-999(8)997×7+21 (9)87×470+870×53(10)(55+55+55+55×5)×125(11)125×(8+40)×25 (12)99+49×99(13)265×97+4×265(14)454+999×999+545(15)9999×36+6666×3×32(16)124×38+65×124+76×110-76×7(17)62×4+44×5+5×18(18)3400-62×34-38×20-38×14(19)1992×-1991×五年级上册简便计算题100道简便计算题:1)6.9+4.8+3.1 0.456+6.22+3.78 15.89+(6.75-5.89) 2)4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.75—6.48)3)3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.24)3.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.475)5.27+2.86-0.66+1.63 13.35-4.68+2.65 73.8-1.64-13.8-5.366)47.8-7.45+8.8 0.398+0.36+3.64 15.75+3.59-0.59+14.257)66.86-8.66-1.34 0.25×16.2×4 (1.25-0.125)×88)3.6×102 3.72×3.5+6.28×3.5 36.8-3.9-6.19)28.6×101-28.6 4.8×7.8+78×0.52 32+4.9-0.910)4.8×100.1 56.5×9.9+56.5 7.09×10.8-0.8×7.0911)25.48-(9.4-0.52) 4.2÷3.5 320÷1.25÷812)18.76×9.9+18.76 3.52÷2.5÷0.4 3.9-4.1+6.1-5.913)5.6÷3.5 9.6÷0.8÷0.4 4.2×99+4.214)17.8÷(1.78×4) 0.49÷1.4 1.25×2.5×3215)15.2÷0.25÷4 0.89×100.1 146.5-(23+46.5)9)28.6×101-28.6 4.8×7.8+78×0.52 32+4.9-0.910)4.8×100.1 56.5×9.9+56.5 7.09×10.8-0.8×7.0911)25.48-(9.4-0.52) 4.2÷3.5 320÷1.25÷812)18.76×9.9+18.76 3.52÷2.5÷0.4 3.9-4.1+6.1-5.913)5.6÷3.5 9.6÷0.8÷0.4 4.2×99+4.214)17.8÷(1.78×4) 0.49÷1.4 1.25×2.5×3215)15.2÷0.25÷4 0.89×100.1 146.5-(23+46.5)18)(45.9-32.7)÷8÷0.125 3.14×0.68+31.4×0.0325.6÷1.25÷0.8÷2.5÷0.419)7.2×0.2+2.4×1.4 8.9×1.01 7.74×(2.8-1.3)+1.5×2.2620)3.9×2.7+3.9×7.3 18-1.8÷0.125÷0.8 12.7×9.9+1.2721)21×(9.3-3.7)-5.6 15.02-6.8-1.02 5.4×11-5.422)2.3×16+2.3×23+2.3 9.43-(6.28-1.57) 3.65×4.7-36.5×0.3723)46×57+23×86 13.7×0.25-3.7÷42.22×9.9+6.66×6.724)101×0.87-0.91×87 10.7×16.1-15.1×10.7 0.79×19918)(45.9-32.7)÷8÷0.125 3.14×0.68+31.4×0.0325.6÷1.25÷0.8÷2.5÷0.419)7.2×0.2+2.4×1.4 8.9×1.01 7.74×(2.8-1.3)+1.5×2.2620)3.9×2.7+3.9×7.3 18-1.8÷0.125÷0.8 12.7×9.9+1.2721)21×(9.3-3.7)-5.6 15.02-6.8-1.02 5.4×11-5.422)2.3×16+2.3×23+2.3 9.43-(6.28-1.57) 3.65×4.7-36.5×0.3723)46×57+23×86 13.7×0.25-3.7÷42.22×9.9+6.66×6.724)101×0.87-0.91×87 10.7×16.1-15.1×10.7 0.79×199 25)4.8+8.63+5.2+0.37 5.93+0.19+2.81 1.76+0.195+3.2426)2.35+1.713+0.287+7.65 1.57+0.245+7.436.02+3.6+1.9827)0.134+2.66+0.866 1.27+3.9+0.73+16.1 7.5+4.9-6.528)3.07-0.38-1.62 1.29+3.7+2.71+6.3 8-2.45-1.5529)3.25+1.79-0.59+1.75 23.4-0.8-13.4-7.20.32×40330)3.2+0.36+4.8+1.64 1.23+3.4-0.23+6.6 0.25×3631)12.7-(3.7+0.84) 36.54-1.76-4.540.25×0.73×432)7.6×0.8+0.2×7.6 0.85×199 0.25×8.5×433)1.28×8.6+0.72×8.6 12.5×0.96×0.8 10.4-9.6×0.3534)0.8×(4.3×1.25) 3.12+3.12×99五年级上册简算和方程一百道有答案1)50+160÷40 (2)120-144÷18+35 (3)347+45×2-4160÷52(4)(58+37)÷(64-9×5)(5)95÷(64-45)(6)178-145÷5×6+42(7)812-700÷(9+31×11)( 8)85+14×(14+208÷26)(9)(284+16)×(512-8208÷18)(10)120-36×4÷18+35(11)(58+37)÷(64-9×5)(12)(6.8-6.8×0.55)÷8.5(13)0.12× 4.8÷0.12×4.8 (14)(3.2×1.5+2.5)÷1.6(15)3.2×(1.5+2.5)÷1.6 (16)6-1.6÷4 (17)7.2÷0.8-1.2×5(18)6.5×(4.8-1.2×4)(19)0.68×1.9+0.32×1.9(20)10.15-10.75×0.4-5.7 (21)5.8×(3.87-0.13)+4.2×3.74(22)32.52-(6+9.728÷3.2)×2. (23)(136+64)×(65-345÷23)(24) 420+580-64×21÷28 (25)(58+370)÷(64-45)五年级上册数学简便计算,要简单点及答案遇到不会的题就上网找答案照抄,根本不想动脑筋,会让学生养成,在网上是问不到答案的哈不思考的习惯,改正吧,多思考做题不怕做错,就怕不思考简便计算15道五年级上册答案75×102=75*(100+2)=75*100+75*2=7500+150=76501.2×2.5=(1+0.2)*2.5=1*2.5+0.2*2.5=2.5+0.5=390.1-9.9=(90+0.1)-(10-0.1)=90+0.1-10+0.1=80+0.2=80.290.1×9.9=(90+0.1)*(10-0.1)=900-9+1-0.01=908-0.01=907.993.54×99+3.54=3.54*99+3.54*1=3.54*(99+1)=3.54*100=354272÷125=272*8/125*8=2176/1000=2.176五年级上册奥数题及答案(简单的)1、蜘蛛有8只脚,蜻蜓有6只脚和2对翅膀,苍蝇有6只脚和1对翅膀。
五年级上册简便运算练习题及答案课件
五年级上册简便运算练习题及答案请用简便方法计算下列各题0.25 ×0.20.125 × 3.2 × 2.535×40.20.25 ×4÷0.25 × 4.5 ×9.93.5 ×99+3.53.5 ×101 -3.53.53.5 × 2.7 - 3.5 ×0.74.9 ÷ 3.57.35 ÷.353.29+0.73+2.273.29-0.73-2.2.5+2.5-7.5+2.57.325-3.29-3.32.325-7.325-×9.9+3.5 ×0.1.5 ÷0..5 ÷0.25 ÷÷7.325 - × 2.7+35×0.7 ÷0.6 - 0.5 ÷0. ÷0.12 ÷ 83.29+0.73- 2.29+2.23.29 ×0.25 ×0.125×8.863.4 ÷ 2.5 ÷0..9 ÷ 1.4.9 ÷÷0.70.35 × 1.25 ×2×0.828.6 ×101-28.614 -7.32 -2.62.64×0.47.6 ×0.8 +0.2 ×7.60.25 ×362.5 × 2.432.4 ×0.9 +0.1 ×32.40.86 ×15.7 -0.86 ×14.7 +8.67 +7.36 +11.39.16 × 1.5 -0.5 ×9.163.60.85 ×19 × 3.2 × 2.552.7 ÷4515÷0.252.4 ×102.31× 1.2 ×0.5 -3.6 ×0.0.25 ×8.5 ×4×40.20.125五年级数学简便计算练习卷四7.6 ×0.8 +0.2 ×7.60.85 ×190.25×8.5 × 41.28 ×8. 6 +0.72 ×8. 12.5 ×0.96 ×0.810.4 -9.6 ×0.350.8 × 3.12 +3.12 ×9928.6×101-28.60.86 ×15.7 -0.86 ×14..4 ×102.31× 1.2 ×0.514 -7.32 -2.62.64 +8.67 +7.36 +11.30÷28×0.49.16 × 1.5 -0.5 ×9.163.6 -3.6 ×0.54.5 ÷ 1..2 ÷ 3.30 ÷0.6 ÷ 563.4 ÷ 2.5 ÷0.4.9 ÷ 1.4.9 ÷÷0.72.5 × 2..7 ÷15÷0.35 × 1.25 ×2×0.82.4 ×0.9 +0.1 ×32. 15 ÷0.25五年级数学简便计算练习卷三46×57 +23×813.7×0.25 -3.7 ÷.22 ×9.9+6.66 × 6.7101×0.87 - 0.91 ×810.7×16.1 - 15.1 ×10.70.79 ×1994.8+8.63+5.2+0.5.93+0.19+2.81 1.76+0.195+3.242.35+1.713+0.287+7.61.57+0.245+7.6.02+3.6+1.980.134+2.66+0.8661.27+3.9+0.73+16.1 .5 +4.9 -6.53.07 -0.38 -1.1.29 +3.7 +2.71 +6.8 -2.45 -1.553.25 +1.79 -0.59 +1.7523.4 -0.8 -13.4 -7.0.32 ×4033.2 +0.36 +4.8 +1.61.23 +3.4 -0.23 +6.60.25 ×3612.7 -6.54 -1.76 -4.540.25 ×0.73 × 4五年级数学简便计算练习卷二18.76×9.9 +18.763.52 ÷ 2.5 ÷0.4.9 - 4.1 +6.1 -5.95.6 ÷ 3.9.6 ÷0.8 ÷0..2 ×99+ 4.217.8 ÷0.49 ÷ 1. 1.25 × 2.5 ×323.65 ×10.115.2 ÷0.25 ÷40.89×100.1 146.5 -3.83 ×4.56 +3.83 ×5.444.36 ×12.5 ×89.7 ×99+9.727.5 × 3.7 -7.5 × 3.78.54 ÷ 2.5 ÷0.0.65 ×101.2×0.25 ×12.5÷8÷0.1253.14 ×0.68 +31.4×0.032.6 ÷ 1.25 ÷0.8 ÷2.5 ÷0.47.2 ×0.2 +2.4 × 1..9 × 1.01.74 ×+1.5 × 2.263.9 × 2.7 +3.9 ×7.318-1.8 ÷0.125÷0.12.7 ×9.9+1.2721×-5.615.02-6.8- 1.025.4 ×11 -5.42.3 ×16+2.3×23+2..43 - .65 × 4.7 -36.5 ×0.37五年级数学简便计算练习卷一下面各题怎样算简便就怎样算。
小学数学五年级上册简便计算68道题(含详细规范标准答案)
小学数学五年级上册简便计算68道题(含详细规范标准答案)一、加减法简便计算1. 123 + 456 = 5792. 789 321 = 4683. 678 + 123 456 = 3454. 456 + 789 123 = 11225. 987 + 654 321 = 13206. 789 + 456 123 = 11227. 654 + 321 987 = 3128. 321 + 987 654 = 6549. 123 + 456 + 789 = 136810. 456 + 789 + 123 = 1368二、乘除法简便计算11. 7 × 8 = 5612. 9 ÷ 3 = 313. 12 × 13 = 15614. 15 ÷ 5 = 315. 18 × 19 = 34216. 21 ÷ 7 = 317. 24 × 25 = 60018. 27 ÷ 9 = 319. 30 × 31 = 93020. 33 ÷ 11 = 3三、混合运算简便计算21. 12 + 7 × 8 = 6822. 9 ÷ 3 + 6 = 723. 12 × 13 45 = 14124. 15 ÷ 5 + 8 = 725. 18 × 19 + 21 = 35726. 21 ÷ 7 4 = 127. 24 × 25 12 = 58828. 27 ÷ 9 + 3 = 629. 30 × 31 15 = 91530. 33 ÷ 11 2 = 1四、分数简便计算31. 1/2 + 1/3 = 5/632. 2/3 ÷ 1/4 = 8/333. 3/4 + 1/2 = 5/434. 4/5 ÷ 1/2 = 8/535. 5/6 + 1/3 = 7/636. 6/7 ÷ 1/4 = 24/737. 7/8 + 1/2 = 11/838. 8/9 ÷ 1/3 = 839. 9/10 + 1/5 = 13/1040. 10/11 ÷ 1/2 = 20/11五、小数简便计算41. 0.5 + 0.3 = 0.842. 0.6 ÷ 0.2 = 343. 0.7 × 0.8 = 0.5644. 0.4 ÷ 0.4 = 145. 0.9 + 0.1 = 146. 0.8 ÷ 0.2 = 447. 0.7 × 0.9 = 0.6348. 0.6 ÷ 0.3 = 249. 0.5 + 0.2 = 0.750. 0.4 ÷ 0.2 = 2六、百分数简便计算51. 20% + 30% = 50%52. 40% ÷ 20% = 253. 50% × 80% = 40%54. 25% + 75% = 100%55. 60% ÷ 30% = 256. 70% × 50% = 35%57. 80% + 20% = 100%58. 90% ÷ 10% = 959. 55% × 45% = 24.75%60. 65% + 35% = 100%七、方程简便计算61. 2x + 3 = 7,解得 x = 262. 3x 4 = 5,解得 x = 363. 4x + 5 = 9,解得 x = 164. 5x 6 = 4,解得 x = 265. 6x + 7 = 13,解得 x = 166. 7x 8 = 9,解得 x = 367. 8x + 9 = 17,解得 x = 168. 9x 10 = 11,解得 x = 3八、应用题简便计算69. 小华有10个苹果,小明有15个苹果,他们一共有多少个苹果?解:10 + 15 = 25个苹果。
小学数学五年级简便计算题及答案_PDF压缩
五年级数学简便计算题及答案3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.57.325-3.29-3.325 7.325-(5.325+1.7) 3.29+0.73-2.29+2.273.29×0.25×4 0.125×8.8 0.25×0.28 0.125×3.2×2.5 35×10.2 0.25×4÷0.25×4 3.5×101-3.5 3.5×9.9+3.5×0.1 3.5×2.7+35×0.733.5×2.7-3.5×0.7 (32+5.6)÷0.8 3.5÷0.6-0.5÷0.64.9÷1.4 7÷0.25÷4 7÷0.1257.35÷(7.35×0.25) 7.35÷(7.35÷0.25)3.07-0.38-1.62 1.29+3.7+2.71+6.38-2.45-1.55 3.25+1.79-0.59+1.7523.4-0.8-13.4-7.2 0.32×4033.2+0.36+4.8+1.64 1.23+3.4-0.23+6.6 0.25×3612.7-(3.7+0.84)36.54-1.76-4.54 0.25×0.73×4 7.6×0.8+0.2×7.6 0.85×199 0.25×8.5×41.28×8.6+0.72×8.6 12.5×0.96×0.8 10.4-9.6×0.350.8×(4.3×1.25) 3.12+3.12×99 28.6×101-28.6 (4.23+6.17)×0.8 0.86×15.7-0.86×14.7 2.4×102 14-7.32-2.68 2.64+8.67+7.36+11.33答案3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5=3.29+(0.73+2.27) =3.29-(0.73+2.27) =(7.5-7.5)+(2.5+2.5)=3.29+3 =3.29-3 =0+5=6.29 =0.29 =5(加法结合律)(减法的性质)(同级运算交换)7.325-3.29-3.325 7.325-(5.325+1.7)=7.325-3.325-3.29 =7.325-5.325-1.7=4-3.29 =2-1.7=0.71 =0.3(减法交换)(减法的性质)3.29+0.73-2.29+2.27 3.29×0.25×4 0.125×8.8=(3.29-2.29)+(0.73+2.27) =3.29×(0.25×4)=0.125×8×1.1=1+3 =3.29×1 =1×1.1=4 =3.29 =1.1(同级运算交换)(乘法结合律)(先拆数,乘法结合律)0.25×0.28 0.125×3.2×2.5 35×10.2=0.25×4×0.07 =(0.125×8)×(0.4×2.5)=35×(10+0.2)=1×0.07 =1×1 =35×10+35×0.2=0.07 =1 =350+7(先拆数,乘法结合律)(拆数,乘法结合律) =357(拆数,乘法分配律)0.25×4÷0.25×4=(0.25÷0.25)×(4×4)=1×16=16(同级运算交换)3.5×101-3.5 3.5×9.9+3.5×0.1 ★ 3.5×2.7+35×0.73=3.5×(101-1) =3.5×(9.9+0.1) =3.5×2.7+3.5×7.3=3.5×100 =3.5×10 =3.5×(2.7+7.3)=350 =35 =3.5×10(乘法分配律)(乘法分配律) =35(先利用积不变的规律转化,然后再用乘法分配律)3.5×2.7-3.5×0.7 ★ (32+5.6)÷0.8 ★ 3.5÷0.6-0.5÷0.6=3.5×(2.7-0.7) =32÷0.8+5.6÷0.8 =(3.5-0.5)÷0.6=3.5×2 =40+7 =3÷0.6=7 =47 =5(乘法分配律)(后2题类似分配律,但只适用于(a+b)÷c和(a-b)÷c,而a÷(b+c)和a÷(b-c)不能用。
五年级简便计算题目
1、计算:99+999+9999A、11097B、11100C、11098D、10998(答案:A。
解析:把99看作100-1,999看作1000-1,9999看作10000-1,再用加法运算律和减法运算律简算。
)2、计算:125×64A、8000B、7500C、8500D、9000(答案:A。
解析:将64拆分为8×8,然后利用乘法结合律进行简算,125×8=1000,1000×8=8000。
)3、计算:57×99+57A、5700B、5643C、5757D、5800(答案:A。
解析:利用乘法分配律进行简算,57×99+57=57×(99+1)=57×100=5700。
)4、计算:25×32×125A、1000B、10000C、100000D、100(答案:C。
解析:把32拆分为4×8,然后利用乘法结合律进行简算,25×4=100,125×8=1000,100×1000=100000。
)5、计算:48×101-48A、4800B、4848C、4752D、4944(答案:A。
解析:利用乘法分配律进行简算,48×101-48=48×(101-1)=48×100=4800。
)6、计算:37+63×99A、6300B、6264C、6400D、6337(答案:D。
解析:把37拆分为63+(-26),然后利用加法运算律和乘法分配律进行简算,63×99+63-26=63×(99+1)-26=6300-26=6274+3=6337-6=6331+6=6337。
)7、计算:8888×3333+4444×3334A、33330000B、44440000C、22220000D、66660000(答案:A。