一元二次方程计算题及答案.docx

6X2-7X+1=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
-X1=1,X2=1 /6
5X2-18=9X
5X2-9X=18
X2-=3-6
(X- )2=
-X-9= ±
"■,X1 =3,X2=-
4X 2-3X=52
解:X2-( 3/4)X=13
(X-3/8)2=13
.•X-3 /8= ±29 /8
•■,X1 =4,X2 =-13 / 4
5X 2=4-2X
5X 2+2X=4
X2+=
(X+ )2 =
⑵ xA2+6x-27=0
xA2-2x-80=0
xA2+10x-200=0
(5)xA2-20x+96=0
(6)xa2+23x+76=0
(7)xA2-25x+154=0
(8)xA2-12x-108=0
(9)xA2+4x-252=0
(10)xA2-11x-102=0
(11)xA2+15x-54=0
(12)xA2+11x+18=0
(13)xA2-9x+20=0
(14)xA2+19x+90=0
(15)xA2-25x+156=0
(16)xA2-22x+57=0
(17)xA2-5x-176=0
(18)xA2-26x+133=0
(19)xA2+1 Ox-11=0
(20)xA2-3x-304=0
答案:x1=3 x2=-9
答案:X仁-8 x2=10
答案:x1=-20 x2=10
答案:X仁12x2=8
答案:x1=-19 x2=-4
答案:x1=14 x2=11
答案:X仁・6 x2=18
答案:x1=14x2=-18
答案:X仁17x2=-6
答案:x1=-18 x2=3
答案:X仁-2 x2=-9
答案:x1=4 x2=5
答案:x1=-10 x2=-9
答案:x1=13 x2=12
答案:x1=3 x2=19
答案:X仁16x2=11
答案:x1=7 x2=19
答案:x1=-11 x2=1
答案:x1=-16 x2=19
(22)xA2+13x-48=0 答案:x1=3 x2=-16
(25)xA2+14x+45=0
(26)xA2-9x-136=0
(27)xA2-15x-76=0
(28)xA2+23x+126=0
(29)xA2+9x-70=0
(30)xA2-1x-56=0
(31)xA2+7x-60=0
(32)xA2+10x-39=0
(33)xA2+19x+34=0
(34)xA2-6x-160=0
(35)xA2-6x-55=0
(36)xA2-7x-144=0
(37)xA2+20x+5 仁 0
(38)xA2-9x+14=0
(39)xA2-29x+208=0
(40)xA2+19x-20=0
(41)xA2-13x-48=0
(42)xA2+10x+24=0
(43)xA2+28x+180=0
答案:X仁-9 x2=-5
答案:X仁・8 x2=17
答案:X仁19 x2=-4
答案:X仁・9 x2=-14
答案:x1 =-14x2=5
答案:x1=8 x2=-7
答案:x1=5 x2=-12
答案:x1=-13 x2=3
答案:x1=-17 x2=-2
答案:X仁16x2=・10
答案:X仁11 x2=-5
答案:X仁・9 x2=16
答案:X 仁-3 x2=-17
答案:x1=2 x2=7
答案:x1=16 x2=13
答案:x1=-20 x2=1
答案:X仁16x2=・3
答案:X仁・6 x2=-4
答案:x1=-10 x2=-18
(46)xA2+7x+6=0
(47)xA2+16x+28=0 (48)xA2+5x-50=0
(49)xA2+13x-14=0 (50)xA2-23x+102=0 (51)xA2+5x-176=0
(52)xA2-8x-20=0 (53)xA2-16x+39=0
(54)xA2+32x+240=0 (55)x 八2+34x+288=0 (56)xA2+22x+105=0 (57)xA2+19x-20=0 (58)xA2-7x+6=0
(59)xA2+4x-22 仁 0 (60)xA2+6x-9 仁 0
(61)xA2+8x+12=0 (62)xA2+7x-120=0
(63)xA2-18x+17=0
(64)xA2+7x-170=0 (65)xA2+6x+8=0
答案:X仁-6 x2=-1
答案:x1=-14x2=-