计算：x+2y/x-y+2x/y-x-3y/x-y
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计算：x+2y/x-y+2x/y-x-3y/x-y计算：x+2y/x-y+2x/y-x-3y/x-y计算：x+2y/x-y+2x/y-x-3y/x-y原式=(x+2y)/(x-y)-2x/(x-y)-
计算：x+2y/x-y+2x/y-x-3y/x-y
计算：x+2y/x-y+2x/y-x-3y/x-y
计算：x+2y/x-y+2x/y-x-3y/x-y
原式=(x+2y)/(x-y)-2x/(x-y)-3y/(x-y)
=(x+2y-2x-3y)/(x-y)
=(-x-y)/(x-y)
答案是（-2xy^2-y^2+2x^2）/(xy)
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