阅读下面式子变形x^2+2x-3x=x^2+2x+1-4=(x+1)^2-2^2=(x+1+2)(x+1-2)=(x+3)(x-1)然后因式分解x^2-6x-1

问题描述:

阅读下面式子变形
x^2+2x-3x=x^2+2x+1-4=(x+1)^2-2^2=(x+1+2)(x+1-2)=(x+3)(x-1)然后因式分解x^2-6x-1