数学计算(x²-y²)(x+y)÷(x+y)²A.x-y B.x+y C.x²+y² D.x²-y²

数学计算(x²-y²)(x+y)÷(x+y)²A.x-y B.x+y C.x²+y² D.x²-y²
数学计算(x²-y²)(x+y)÷(x+y)²
A.x-y B.x+y C.x²+y² D.x²-y²

数学计算(x²-y²)(x+y)÷(x+y)²A.x-y B.x+y C.x²+y² D.x²-y²
答：
(x²-y²)(x+y)÷(x+y)²
=(x-y)(x+y)(x+y)÷(x+y)²
=x-y
选择A

解
(x²-y²)(x+y)÷(x+y)²
=(x-y)(x+y)(x+y)÷(x+y)²
=(x-y)
选A

A
(x²-y²)=(x-y)(x+y)
故
(x²-y²)(x+y)÷(x+y)²
=x-y

选择A，用平方差公式解答