[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)

[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
=2(x+y)²+(x-y)²/2