a(x平方+2xy+y平方)-b(x平方-y平方)的值

问题描述:

a(x平方+2xy+y平方)-b(x平方-y平方)的值

a(x²+2xy+y²)-b(x²-y²)
=a(x+y)²-b(x+y)(x-y)
=(x+y)(ax+ay-bx+by)你确定对吗?和我已开始算的答案一样耶!