Question

x的平方-2x+(x-2)=0 用分组分解法解方程

Answer 1

1、

x²-x-2=0

(x-2)(x+1)=0

x=2

x=-1

2、x²-x-2=0

x²-2×1/2x+1/4-9/4=0

(x-1/2)²=9/4

x-1/2=±3/2

x-1/2=3/2 x=2

x-1/2=-3/2 x=-1