若3x=4,9y=7,则3x-2y=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若3x-4y=0,则x/y=______,(x-y)/y=______,(3x+2y)/(2x+3y)=_____.
若2x+3y=2004,则代数式2(3x-2y)-(x-y)+(-x+9y)=...
若5x+3y=3x+4y=x+2y+6,则x+y=___
若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
若x+3y=3x+2y=7,则x+y=几?
若x/y=4/3 则3x+2y/2x-5y=
若3x=7y,则y分之x= ,x:(x:y)=
若3x=7y,则y比x= ,x:(x+y)=
9y=3x-(x-1),4(x+y)-(2x+4)=8y
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )