文档介绍：
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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-=
(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 =
X+= ±
⑵ xA2+6x-27=0
答案：x1=3 x2=-9
⑶ xA2-2x-80=0
答案：x仁-8 x2=10
⑷ xA2+10x-200=0
答案：x1=-20 x2=10
(5)xA2-20x+96=0
答案：x仁12 x2=8
⑹xA2+23x+76=0
答案：x1=-19 x2=-4
(7)xA2-25x+154=0
答案：x1=14 x2=11
(8)xA2-12x-108=0
答案：x仁-6 x2=18
(9)xA2+4x-252=0
答案：x1=14 x2=-18
(10)xA2-11x-102=0
答案：x仁17 x2=-6
(11)xA2+15x-54=0
答案：x1=-18 x2=3
(12)xA2+11x+18=0
答案：x仁-2 x2=-9
(13)xA2-9x+20=0
答案：x1=4 x2=5
(14)xA2+19x+90=0
答案：x1=-10 x2=-9
(15)xA2-25x+156=0
答案：x1=13 x2=12
(16)xA2-22x+57=0
答案：x1=3 x2=19
(17)xA2-5x-176=0
答案：x仁16 x2=-11
(18)xA2-26x+133=0
答案：x1=7 x2=19
(19)xA2+10x-11=0
答案：x1=-11 x2=1
(20)xA2-3x-304=0
答案：x1=-16 x2=19
(21)xA2+13x-140=0
答案：x1=7 x2=-20
(22)xA2+13x-48=0
答案：x1=3 x2=-16
(23)xA2+5x-176=0 答案：x1=-16 x2=11
(24)xA2+28x+171=0
答案：x仁-9 x2=-19
(25)xA2+14x+45=0
答案：x仁-9 x2=-5
(26)xA2-9x-136=0
答案：x仁-8 x2=17
(27)xA2-15x-76=0
答案：x仁19 x2=-4
(28)xA2+23x+126=0
答案：x仁-9 x2=-14
(29)xA2+9x-70=0
答案：x1=-14 x2=5
(30)xA2-1x-56=0
答案：x1=8 x2=-7