=(x²-y²)/xy-y(x-y)/[x(y-x)]
=(x²-y²)/xy+y(x-y)/[x(x-y)]
=(x²-y²)/xy+y/x
=(x²-y²)/xy+y²/xy
=(x²-y²+y²)/xy
=x²/xy
=x/y
请问：(x2-y2/xy)-(xy-y2/xy-x2) 怎么算?
1个回答
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