若1/x-1/y=3,5x+3xy-5y/3x-xy-3y
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若1/x-1/y=3,5x+3xy-5y/3x-xy-3y
若1/x-1/y=3,5x+3xy-5y/3x-xy-3y
若1/x-1/y=3,5x+3xy-5y/3x-xy-3y
1/x-1/y=(y-x)/xy=3
所以y-x=3xy
x-y=-3xy
所以原式=[5(x-y)+3xy]/[3(x-y)-xy]
=[5(-3xy)+3xy]/[3(-3xy)-xy]
=-12xy/(-10xy)
=6/5
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
若1/x-1/y=3,5x+3xy-5y/3x-xy-3y
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若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
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若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?
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