x+3y/x^2-y^2-x+2y/x^2-y^2-2x-2y/y^2-x^2

题目详情

▼优质解答

答案和解析

(x+3y)/(x^2-y^2)-(x+2y)/(x^2-y^2)-(2x-2y)/(y^2-x^2)
=[(x+3y)-(x+2y)+(2x-2y)]/(x^2-y^2)
=(2x-y)/(x^2-y^2)

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