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已知x分之1-y分之1=5,求分式3x+5xy-3y分之x-3xy-y的值
人气:244 ℃ 时间:2019-10-11 03:00:24
解答
1/X-1/Y=5
Y-X=5XY,
(X-3XY-Y)/(3X+5XY-3Y)
=[-(Y-X)-3XY]/[-3(Y-X)+5XY]
=(-8XY)/(-10XY)
=4/5.
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