1/X-1/Y=3,求5x+3xy-5y/x-2xy-y
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1/X-1/Y=3,求5x+3xy-5y/x-2xy-y1/X-1/Y=3,求5x+3xy-5y/x-2xy-y1/X-1/Y=3,求5x+3xy-5y/x-2xy-y5x+3xy-5y/x-2xy-
1/X-1/Y=3,求5x+3xy-5y/x-2xy-y
1/X-1/Y=3,求5x+3xy-5y/x-2xy-y
1/X-1/Y=3,求5x+3xy-5y/x-2xy-y
5x+3xy-5y/x-2xy-y
上下同时除以xy
(5/y+3-5/x)/(1/y-2-1/x)
=(-5(1/x-1/y)+3)/(-(1/x-1/y)-2)
=(-5×3+3)/(-3-2)
=12/5
1/x-1/y=x,求5y+xy-5y/y-xy-x=?
X+y=3 xy=1求-5x-5y+3xy的值
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