二、因式分解 1.(x2+1)2-4x² 2.(x-y)2-2(x-y)-8
问题描述:
二、因式分解 1.(x2+1)2-4x² 2.(x-y)2-2(x-y)-8
答
-
(x2+1)2-4x²
2x^2+2-4x^2=2-2x^2=2(1+x)(1-x)
2.(x-y)2-2(x-y)-8
(x-y+2)(x-y-4)
答
1.(x2+1)2-4x²
=(x²+1+2x)(x²+1-2x)
=(x+1)²(x-1)²
2.(x-y)2-2(x-y)-8
=(x-y+2)(x-y-4)