作业帮已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
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已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
化简已知条件得：xy=2(x+y)
代入算式,得：（3(x+y)-10(x+Y))/(6(x+Y)-(x+y))＝-7/5.
注：算式中的5Y应为5XY吧
应该是(3x-5xy+3y)/(-x+3xy-y)
=(3x-10x-10y+3y)/(-x+6x+6y-y)
=-7(x+y)/5(x+y)
=-7/5
仔细看看，你的题应该是写错了，那个3X-5Y+3Y 中，应该有个是xy，如果我没猜错的话
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