一元二次方程计算题及答案120道

优质解析

6X2 -7X+l=0

6X2-7X=-1

X2 -( 7 / 6 ) X+( 7 / 12)2 =-1 / 6 *( 7 / 12 ) 2

(X-7 / 12)2 =25 / 144

/•X-7/ 12=±5/ 12

AX1=1,X2=1 / 6

5X2 -18=9X

5X2 -9X=18

x2 =

()2 =

・°・= ±

/•X1=3,X2=

4X2 -3X=52

解：X2 -( 3 / 4 ) X=13

(X-3 / 8)2 =13

/•X-3/8=±29/8

AX1=4,X2 =-13 / 4

5X2 =4-2X

5X2+2X=4

X2 +=

(X+ ) 2 =

x+=±

X1=-1Z X2=就这么几道，最好去百度搜索，那多l)x A2-9x+8=0答案：xl=8 x2=l

(2)x A2+6x-27=0 答案：xl=3 x2=-9

(3)x A2-2x-80=0 答案：xl=-8 x2=10

(4)x A2+10x-200=0 答案：xl=-20 x2=10

⑸x A2-20x+96=0 答案：xl=12 x2=8

(6)x A2+23x+76=0 答案：xl=-19 x2=-4

(8)x A2-12x-108=0 答案：xl=-6 x2=18

(9)x A2+4x-252=0 答案：xl=14 x2=-18

(10)x A2-llx-102=0 答案：xl=17 x2=-6

(11)x A2+15x-54=0 答案：xl=-18 x2=3

(12)x A2+llx+18=0 答案：xl=-2 x2=-9

(13)x A2-9x+20=0 答案：xl=4 x2=5

(14)x A2+19x+90=0 答案:xl=-10 x2=-9

(15)x A2-25x+156=0 答案:xl=13 x2=12

(16)x A2-22x+57=0 答案：xl=3 x2=19

(17)x A2-5x-176=0 答案：xl=16 x2=-ll

(18)x A2-26x+133=0 答案：xl=7 x2=19

(19)x A2+10x-ll=0 答案：xl=-ll x2=l

(20)x A2-3x-304=0 答案：xl=-16 x2=19

(21)x A2+13x-140=0 答案：xl=7 x2=-20

(22)x A2+13x-48=0 答案：xl=3 x2=-16

(23)x A2+5x-176=0 答案：xl=-16 x2=ll

(24)x A2+28x+171=0 答案：xl=-9 x2=-19

(25)x A2+14x+45=0 答案：xl=-9 x2=-5

(26)x A2-9x-136=0 答案：xl=-8 x2=17 (2刀x A2-15x-76=0 答案：xl=19 x2=-4

(28)x A2+23x+126=0 答案：xl=-9 x2=-14

(29)x A2+9x-70=0 答案：xl=-14 x2=5

(30)x A2-lx-56=0 答案：xl=8 x2=-7

(31)x A2+7x-60=0 答案：xl=5 x2=-12

(32)x A2+10x-39=0 答案：xl=-13 x2=3

(33)x A2+19x+34=0 答案:xl=-17 x2=-2

(34)x A2-6x-160=0 答案：xl=16 x2=-10

(35)x A2-6x-55=0 答案：xl=ll x2=-5

(36)x A2-7x-144=0 答案：xl=-9 x2=16

(37)x A2+20x+51=0 答案：xl=-3 x2=-17

(38)x A2-9x+14=0 答案：xl=2 x2=7

(39)x A2-29x+208=0 答案：xl=16 x2=13

(40)x A2+19x-20=0 答案：xl=-20 x2=l

(42)x A2+10x+24=0 答案：xl=-6 x2=-4

(43)x A2+28x+180=0 答案：xl=-10 x2=-18

(44)x A2-8x-209=0 答案：xl=-ll x2=19

(45)x A2+23x+90=0 答案：xl=-18 x2=-5

(46)x A2+7x+6=0 答案：xl=-6 x2=-l

(47)x A2+16x+28=0 答案：xl=-14 x2=-2

(48)x A2+5x-50=0 答案：xl=-10 x2=5

(49)x A2+13x-14=0 答案：xl=l x2=-14

(50)x A2-23x+102=0 答案：xl=17 x2=6

(51)x A2+5x-176=0 答案：xl=-16 x2=ll

(52)x A2-8x-20=0 答案：xl=-2 x2=10

(53)x A2-16x+39=0 答案：xl=3 x2=13

(54)x A2+32x+240=0 答案：xl=-20 x2=-12

(55)x A2+34x+288=0 答案：xl=-18 x2=-16

(56)x A2+22x+105=0 答案：xl=-7 x2=-15

(57)x A2+19x-20=0 答案：xl=-20 x2=l

(58)x A2-7x+6=0 答案:xl=6 x2=l

(59)x A2+4x-221=0 答案：xl=13 x2=-17

(60)x A2+6x-91=0 答案：xl=-13 x2=7

(61)x A2+8x+12=0 答案：xl=-2 x2=-6

(62)x A2+7x-120=0 答案：xl=-15 x2=8

(63)x A2-18x+17=0 答案：xl=17 x2=l

(64)x A2+7x-170=0 答案:xl=-17 x2=10

(65)x A2+6x+8=0 答案:xl=-4 x2=-2

(66)x A2+13x+12=0 答案：xl=-l x2=-12

(67)x A2+24x+119=0 答案:xl=-7 x2=-17

(68)x A2+llx-42=0 答案：xl=3 x2=-14

(69)x A20x-289=0 答案：xl=17 x2=-17

(70)x A2+13x+30=0 答案：xl=-3 x2=-10

(71)x A2-24x+140=0 答案：xl=14 x2=10