一元二次方程计算题及答案解析.docx

文档介绍：6X2-7X=-1
X2-( 7/6)X+(7/12)2=-l / 6 +(7/12)2
( X-7 / 12)2=25 / 144
.-.X-7/12=±5/12
.-.Xl=l,X2=l/6
5X2-18=9X
5X2-9X=18
X2-=
( X-)2=
..X-.9 二±
.•.X1=3,X2=-
4X2-3X=52
解:X2-(3/4)X=13
(X-3 / 8 ) 2:13
.*.X-3/8=±29/8
.-.X1=4,X2 =-13/4
5X2=4-2X
5X2+2X=4
X2+=
< X+)2 =
XI二-LX2=,最好去百度搜索,那多l)xA2-9x+8=0答案:xl=8x2=l (2)xA2+6x-27=0 答案:xl=3 x2=-9
(3)xA2-2x-80=0 答案:xl=-8 x2=10 (4)xA2+10x-200=0 答案:xl=-20 x2=10
(5)xA2-20x+96=0 答案:xl=12 x2=8
(6)xA2+23x+76=0 答案:xl=-19 x2=-4 (7)xA2-25x+154=0 答案:xl=14 x2=ll
(8)xA2-12x-108=0 答案:xl二-6x2= 18 (9)xA2+4x-252=0 答案:xl=14 x2=-18 (10)xA2-llx-102=0 答案:xl=17 x2=-6 (ll)xA2+15x-54=0 答案:xl=-18 x2=3 (12)xA2+llx+18=0 答案:xl=-2 x2=-9
(13)xA2-9x+20=0 答案:xl=4x2=5
(14)xA2+19x+90=0 答案:xl=-10 x2=-9 (15)xA2-25x+156=0 答案:xl=13 x2=12 (16)xA2-22x+57=0 答案:xl=3 x2=19 (17)xA2-5x-176=0 答案:xl二 16x2=-11 (18)xA2-26x+133=0 答案:xl=7x2=19 (19)xA2+10x-ll=0 答案:xl=-llx2=l (20)xA2-3x-304=0 答案:xl=-16 x2=19 (21)xA2+13x-140=0 答案:xl=7 x2=-20
(24)xA2+28x+171=0 答案:xl=-9 x2=-19
(25)xA2+14x+45=0 答案:xl=-9 x2=-5
(26)xA2-9x-136=0 答案:xl=-8x2 = 17
(27)xA2-15x-76=0 答案:xl=19 x2=-4
(28)xA2+23x+126=0 答案:xl=-9 x2=-14
(29)xA2+9x-70=0 答案:xl=-14 x2 = 5
(30)xA2-lx-56=0 答案:xl=8x2二-7
(31)xA2+7x-60=0 答案:xl=5 x2=-12
(32)xA2 + 10x-39=0 答案:xl=-13 x2=3
(33)xA2+19x+34=0 答案:xl二-17x2=2
(34)xA2-6x-160=0 答案:xl二 16x2=-10
(35)xA2-6x-55=0 答案:xl= 11x2=