[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
问题描述:
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
答
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
=2(x+y)²+(x-y)²/2