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(x-y)/(x+y)与（x^2-y^2)/(x+y)^2是否相等
题目详情
(x-y)/(x+y)与（x^2-y^2)/(x+y)^2是否相等
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答案和解析
x+y是分母,即x+y≠0
(x²-y²)/(x+y)²=(x-y)(x+y)/(x+y)²=(x-y)/(x+y)
(x²-y²)/(x+y)²=(x-y)(x+y)/(x+y)²=(x-y)/(x+y)
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