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