(5)a(x²+2xy+y²)-b(x²-y²)

问题描述:

(5)a(x²+2xy+y²)-b(x²-y²)

(5)a(x²+2xy+y²)-b(x²-y²)
=a(x+y)²-b(x+y)(x-y)
=(x+y)(ax+ay-bx+by)