初三數(shù)學上冊第二單元試卷：一元二次方程練習題
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
這些題挺好,夠嗎?還行嗎?