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x/(x-y)*y^2/(x+y)-(x+y)/(x^4-y^4)÷【x^2/(x^2+y^2)】

分类: 作业答案 • 2022-06-19 22:13:51
问题描述：

x/(x-y)*y^2/(x+y)-(x+y)/(x^4-y^4)÷【x^2/(x^2+y^2)】

答

=xy^2/(x^2-y^2)-(x+y)/[(x^2-y^2)(x^2+y^2)].(x^2+y^2)/x^2
=xy^2/(x^2-y^2)-(x+y)/[(x^2-y^2)*x^2]
=(x^3y^2-x-y)/(x^4-x^2y^2)

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