因式分解:a2-b2+2a-2b=_.

问题描述:

因式分解:a2-b2+2a-2b=______.

a2-b2+2a-2b,
=(a-b)(a+b)+2(a-b),
=(a-b)(a+b+2).
故答案为:(a-b)(a+b+2).