因式分解 m方+2mn+n方-2m-2n-8

问题描述:

因式分解 m方+2mn+n方-2m-2n-8

(m+n+2)(m+n-4)

m²+2mn+n²-2m-2n-8
=(m+n)²-2(m+n)-8
=(m+n-4)(m+n+2)