一元二次方程计算题及答案.doc

< 7 / 12）

2

6X 2

-7X+l=0

6X 2-7X=-1

X 2-（ 7 / 6）X+ < 7 / 12）― 1/6 ♦ （X-7/12 > 2=25/144

.*.X-7/12=±5/12

.-.Xl=l z X2 = l/6

5X 2-18=9X

5X 2-9X=18

X 2-1.8X=3.6

（X-0.9）2=4.41 /.X-.9=±2.1

/.X1 = 3Z X2 = -1.2

4X 2-3X=52

解：X2・（3/4）X=13

（X-3/8）2=13

.\X-3/8=±29/8

.•.X1=4Z X2 =・ 13/4

5X 2=4-2X

5X 2+2X=4

X 2+0.2X=0.8

（X+O.l ）2

=0.81 X+0.1 二 ±0.9

Xl=-l,X2=0.8就这么几道晨好去百度搜索，那多l)x A2-9x+8=0答案:xl=8x2=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

(5)x A2-20x+96=0 答案:xl=12 x2=8

(6)x A2+23x+76=0 答案:xl=-19 x2=-4

(7)x A2-25x+154=0 答案:xl=14 x2 = ll

(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=7x2 = 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

(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

(27)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=llx2=-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

(41)x A2-13x-48=0 答案:xl=16 x2 = -3

(42)x A2+10x+24=0 答案:xl=-6 x2=-4

(43)x A2+28x+180=0 答案:xl=-10 x2=-18

(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・50二0 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