一元二次方程计算题及答案120道(总5页).doc

优质解析6X-7X+1=06X-7X=-1X-76X+712=-16712 X-712=25144X-712=512X1=1,X2=165X-18=9X5X-9X=18X-1.8X=3.6 X-0.9=4.41X-.9=2.1X1=3,X2=-1.24X-3X=52解 ：X-34X=13 X-38=13X-38=298X1=4,X2 =-1345X=4-2X5X+2X=4X+0.2X=0.8X+0.1 =0.81X+0.1=0.9X1=-1,X2=0.8 就这么几道,最好去百度搜索,那多 1)x2-9x+8=0 答案：x1=8 x2=1(2)x2+6x-27=0 答案：x1=3 x2=-9(3)x2-2x-80=0 答案：x1=-8 x2=10(4)x2+10x-200=0 答案：x1=-20 x2=10(5)x2-20x+96=0 答案：x1=12 x2=8(6)x2+23x+76=0 答