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
(73)x A2+27x+170=0 答案：xl=-10 x2=-17
(74)x A2+27x+152=0 答案：xl=-19 x2=-8
(75)x A2-2x-99=0 答案：xl=ll x2=-9
(76)x A2+12x+ll=0 答案：xl=-ll x2=-l
(77)x A2+17x+70=0 答案：xl=-10 x2=-7
(78)x A2+20x+19=0 答案：xl=-19 x2=-l
(79)x A2-2x-168=0 答案：xl=-12 x2=14
(80)x A2-13x+30=0 答案：xl=3 x2=10
(81)x A2-10x-119=0 答案：xl=17 x2=-7
(82)x A2+16x-17=0 答案：xl=l x2=-17
(83)x A2-lx-20=0 答案:xl=5 x2=-4
(84)x A2-2x-288=0 答案：xl=18 x2=-16
(85)x A2-20x+64=0 答案：xl=16 x2=4
(86)x A2+22x+105=0 答案：xl=-7 x2=-15
(87)x A2+13x+12=0 答案：xl=-l x2=-12
(88)x A2-4x-285=0 答案：xl=19 x2=-15
(89)x A2+26x+133=0 答案：xl=-19 x2=-7
(90)x A2-17x+16=0 答案：xl=l x2=16
(91)x A2+3x-4=0 答案：xl=l x2=-4
(92)x A2-14x+48=0 答案：xl=6 x2=8
(93)x A2-12x-133=0 答案：xl=19 x2=-7
(94)x A2+5x+4=0 答案：xl=-l x2=-4
(95)x A2+6x-91=0 答案：xl=7 x2=-13
(96)x A2+3x-4=0 答案：xl=-4 x2=l
(97)x A2-13x+12=0 答案：xl=12 x2=l
(98)x A2+7x-44=0 答案:xl=-ll x2=4
(99)x A2-6x-7=0 答案：xl=-l x2=7 (100)x A2-9x-90=0 答案：xl=15 x2=-6 (101)x A2+17x+72=0 答案:xl=-8 x2=-9 (102)x A2+13x-14=0 答案：xl=-14 x2=l
(104)x A2-9x-90=0 答案：xl=-6 x2=15 (105)x A2+14x+13=0 答案：xl=-l x2=-13 (106)x A2-16x+63=0 答案：xl=7 x2=9 (107)x A2-15x+44=0 答案：xl=4 x2=ll (108)x A2+2x-168=0 答案：xl=-14 x2=12 (109)x A2-6x-216=0 答案:xl=-12 x2=18 (110)x A2-6x-55=0 答案：xl=ll x2=-5 (111)x A2+18x+32=0 答案：xl=-2 x2=-16。