已知1/x+1/y=3,则2x-3xy+2y/x+xy+y=谢谢了,
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已知1/x+1/y=3,则2x-3xy+2y/x+xy+y=谢谢了,
已知1/x+1/y=3,则2x-3xy+2y/x+xy+y=谢谢了,
已知1/x+1/y=3,则2x-3xy+2y/x+xy+y=谢谢了,
由1/x+1/y=3可知,y+x/xy=3(通分求得)即x+y=3xy.又因为需求的代数式可变为:原式=2(x+y)-3xy/(x+y)+xy 将x+y=3xy带入上式,得原式=6xy-3xy/3xy+xy=3xy/4xy=3/4=0.75
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