计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2)

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计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2)
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计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2)
计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2)

计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2)
1-[(x-2y)/(x+2y)] * [(x+y)(x-y)]/-[(x-2y)^2]
=1+(x^2-y^2)/(x^2-4y^2)