若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
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若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?1/x表示：x
若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
1/x表示：x分之一
1/x-1/y=5,则(2x+5xy-2y) / (x-2xy-y) 【分子分母同时除以xy】
=[2(1/x-1/y)+5] / [(1/x-1/y)-2]
=(2×5+5) / (5-2)
=5
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