优质解答
(1)x^2-9x+8=0 答案：x1=8 x2=1
(2)x^2+6x-27=0 答案：x1=3 x2=-9
(3)x^2-2x-80=0 答案：x1=-8 x2=10
(4)x^2+10x-200=0 答案：x1=-20 x2=10
(5)x^2-20x+96=0 答案：x1=12 x2=8
(6)x^2+23x+76=0 答案：x1=-19 x2=-4
(7)x^2-25x+154=0 答案：x1=14 x2=11
(8)x^2-12x-108=0 答案：x1=-6 x2=18
(9)x^2+4x-252=0 答案：x1=14 x2=-18
(10)x^2-11x-102=0 答案：x1=17 x2=-6
(11)x^2+15x-54=0 答案：x1=-18 x2=3
(12)x^2+11x+18=0 答案：x1=-2 x2=-9
(13)x^2-9x+20=0 答案：x1=4 x2=5
(14)x^2+19x+90=0 答案：x1=-10 x2=-9
(15)x^2-25x+156=0 答案：x1=13 x2=12
(16)x^2-22x+57=0 答案：x1=3 x2=19
(17)x^2-5x-176=0 答案：x1=16 x2=-11
(18)x^2-26x+133=0 答案：x1=7 x2=19
(19)x^2+10x-11=0 答案：x1=-11 x2=1
(20)x^2-3x-304=0 答案：x1=-16 x2=19
(1)x^2-9x+8=0 答案：x1=8 x2=1
(2)x^2+6x-27=0 答案：x1=3 x2=-9
(3)x^2-2x-80=0 答案：x1=-8 x2=10
(4)x^2+10x-200=0 答案：x1=-20 x2=10
(5)x^2-20x+96=0 答案：x1=12 x2=8
(6)x^2+23x+76=0 答案：x1=-19 x2=-4
(7)x^2-25x+154=0 答案：x1=14 x2=11
(8)x^2-12x-108=0 答案：x1=-6 x2=18
(9)x^2+4x-252=0 答案：x1=14 x2=-18
(10)x^2-11x-102=0 答案：x1=17 x2=-6
(11)x^2+15x-54=0 答案：x1=-18 x2=3
(12)x^2+11x+18=0 答案：x1=-2 x2=-9
(13)x^2-9x+20=0 答案：x1=4 x2=5
(14)x^2+19x+90=0 答案：x1=-10 x2=-9
(15)x^2-25x+156=0 答案：x1=13 x2=12
(16)x^2-22x+57=0 答案：x1=3 x2=19
(17)x^2-5x-176=0 答案：x1=16 x2=-11
(18)x^2-26x+133=0 答案：x1=7 x2=19
(19)x^2+10x-11=0 答案：x1=-11 x2=1
(20)x^2-3x-304=0 答案：x1=-16 x2=19