作业帮xy/x+y=2 求3x-5xy+3y/-x+3xy-y的值?
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xy/x+y=2 求3x-5xy+3y/-x+3xy-y的值?
xy/x+y=2 求3x-5xy+3y/-x+3xy-y的值?
xy/x+y=2 求3x-5xy+3y/-x+3xy-y的值?
xy/x+y=2
xy=2(x+y)
3x-5xy+3y/-x+3xy-y
=3(x+y)-5*2(x+y)/-x-y+3*2(x+y)
=-7(x+y)/5(x+y)
=-1.4
答案;
7/5
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