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求x-xy+y分之3x+xy+3y 其中xy分之x+y=3
人气:498 ℃ 时间:2020-03-22 10:42:01
解答
xy分之x+y=3
x+y=3xy
x-xy+y分之3x+xy+3y
=[3(x+y)+xy]/[(x+y)-xy]
=(9xy+xy)/(3xy-xy)
=10xy/2xy
=5
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