计算:(1+ y/x-y )·(1- x/x+y)
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计算:(1+y/x-y)·(1-x/x+y)计算:(1+y/x-y)·(1-x/x+y)计算:(1+y/x-y)·(1-x/x+y)
计算:(1+ y/x-y )·(1- x/x+y)
计算:(1+ y/x-y )·(1- x/x+y)
计算:(1+ y/x-y )·(1- x/x+y)
计算:(1+ y/x-y )·(1- x/x+y)
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