已知xy/x+y=2,求3x-5x+3y/-x+3xy-y的值.快点,明天要交啦!是3x-5x+3y，不是3x-5xy+3y。我也怀疑题目错了！

来源：学生作业帮助网编辑：作业帮时间：2024/04/29 19:42:39

已知xy/x+y=2,求3x-5x+3y/-x+3xy-y的值.快点,明天要交啦!是3x-5x+3y，不是3x-5xy+3y。我也怀疑题目错了！
已知xy/x+y=2,求3x-5x+3y/-x+3xy-y的值.
快点,明天要交啦!
是3x-5x+3y，不是3x-5xy+3y。我也怀疑题目错了！

已知xy/x+y=2,求3x-5x+3y/-x+3xy-y的值.快点,明天要交啦!是3x-5x+3y，不是3x-5xy+3y。我也怀疑题目错了！
xy/(x+y)=2
x+y=1/2xy
(3x-5xy+3y)/(-x+3xy-y)
=[3(x+y)-5xy]/[-(x+y)+3xy]
=(3/2xy-5xy)/(-1/2xy+3xy)
=(3/2-5)/(3-1/2)
=-7/5
你是不是分子分母写倒了
若是xy 是分母
x+y是分子
(x+y)/xy=2
x+y=2xy
(-x+3xy-y)/(3x-5xy+3y)
=[-(x+y)+3xy]/[3(x+y)-5xy]
=(-2xy+3xy)/(6xy-5xy)
=xy/(xy)
=1

是不是错了

∵xy/[x+y]=2,
∴（X+y）/xy=1/2
∴1/x+1/y=1/2
故原式=[3（1/x+1/y）-5]/[-(1/x+1/Y)+3]=(3/2-5)/(-1/2+3)=-7/5

xy/(x+y)=2
xy=2(x+y)
3x-5xy+3y/-x+3xy-y
=[3(x+y)-5xy]/[-(x+y)+3xy]
=[3(x+y)-5*2(x+y)]/[-(x+y)+3*2(x+y)]
=-7(x+y)/(5(x+y)
=-7/5

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