x+y分之xy=3,
xy/(x+y)=3,
xy=3(x+y)
-x+3xy-y分之2x-3xy+2y
=(2x-3xy+2y)/(-x+3xy-y)
=[2x-9(x+y)+2y]/[-x+9(x+y)-y]
=-7(x+y)/8(x+y)
=-7/8
已知x+y分之xy=3,求-x+3xy-y分之2x-3xy+2y的值
已知x+y分之xy=3,求-x+3xy-y分之2x-3xy+2y的值
数学人气：562 ℃时间：2019-09-25 21:53:04
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