计算:[(x+y)³ - (x+y)²]÷(x+y)²=_____

问题描述:

计算:[(x+y)³ - (x+y)²]÷(x+y)²=_____

[(x+y)³ - (x+y)²]÷(x+y)²
=(x+y)³ ÷(x+y)²- (x+y)²÷(x+y)²
=(x+y)-1
=x+y-1