作业帮若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值
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若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值
若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值
若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值
(3x-5xy+3y)÷(-x+3xy-y)
=(3x+3y-10x-10y)÷(-x-y-6x-6y)
=-7(x+y)÷[-7(x+y)]
=1
将xy=2（x+y)代入方程得
-7（x+y）/5(x+y)
=-7/5
-7/5
将已知xy=2（x+y)代入公式得
[3x-5*2(x+y)+3y]÷[-x+3*2(x+y)-y]
=[3x-10x-10y+3y]÷[-x+6x+6y-y]
=[-7(x+y)]÷[5(x+y)]
=-7/5
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