计算(X^2-y^2)(x+y)÷(X+y)^2等于 (过程)
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计算(X^2-y^2)(x+y)÷(X+y)^2等于(过程)计算(X^2-y^2)(x+y)÷(X+y)^2等于(过程)计算(X^2-y^2)(x+y)÷(X+y)^2等于(过程)(X^2-y^2)(
计算(X^2-y^2)(x+y)÷(X+y)^2等于 (过程)
计算(X^2-y^2)(x+y)÷(X+y)^2等于 (过程)
计算(X^2-y^2)(x+y)÷(X+y)^2等于 (过程)
(X^2-y^2)(x+y)÷(X+y)^2
=(x+y)(x-y)(x+y)÷(x+y)^2
=x-y
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