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化简(x-y)/(x^1/3-y^1/3)-(x+y)/(x^1/3+y^1/3)
题目详情
化简(x-y)/(x^1/3-y^1/3)-(x+y)/(x^1/3+y^1/3)
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答案和解析
(x-y)/(x^1/3-y^1/3)-(x+y)/(x^1/3+y^1/3)
=(x^1/3-y^1/3)(x^2/3+x^1/3y^1/3+y^2/3)/(x^1/3-y^1/3)-(x^1/3+y^1/3)(x^2/3-x^1/3y^1/3+y^2/3)/(x^1/3+y^1/3)
=(x^2/3+x^1/3y^1/3+y^2/3)-(x^2/3-x^1/3y^1/3+y^2/3)
=2x^1/3y^1/3
=(x^1/3-y^1/3)(x^2/3+x^1/3y^1/3+y^2/3)/(x^1/3-y^1/3)-(x^1/3+y^1/3)(x^2/3-x^1/3y^1/3+y^2/3)/(x^1/3+y^1/3)
=(x^2/3+x^1/3y^1/3+y^2/3)-(x^2/3-x^1/3y^1/3+y^2/3)
=2x^1/3y^1/3
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