计算2x/1-x+y/1·(2x/x+y-x-y)
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计算2x/1-x+y/1·(2x/x+y-x-y)
计算2x/1-x+y/1·(2x/x+y-x-y)
计算2x/1-x+y/1·(2x/x+y-x-y)
分子分母写反了吧,注意分数线/相当于除号,左边是分子,右边才是分母
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