已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
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已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
-2x+6xy-2y/(7x+5y)-9xy-(3x+y)
=[3(x+y)-x-y]/[7x+5y-9/2(x+y)-3x-y]
=2(x+y)/[-1/2(x+y)]
=-4
(-2x+6xy-2y)/[(7x+5y)-9xy-(3x+y)]
=[-2(x+y)+6xy]/[(7x+5y-9xy-3x-y)]
=(-4xy+6xy)/[4(x+y)-9xy]
=2xy/(8xy-9xy)
=2xy/(-xy)
=-2
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