已知2x+3y=82,x+y=35,则x等于( )y,等于( )
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已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知2x=3y,则y分之x=< >,y分之x+y=< >.
比例线段:已知x/y=2/3,则 x/x+y= ,x-y/x+y= 要过程!
已知|x+y-3|+(x-y)2=0则
已知2x+3y=82,x+y=35,则x等于( )y,等于( )
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已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
已知x+2y=3则x=? x-y=7则y=?
已知(3x+y+6)²+|x+y+2|=2,则x=,y=.
已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
已知2x-3y=0则3x-y比x+2y=
已知x-y=3则5(x-y)-3x+3y-2=
已知x-y=3则5(x-y)-3x+3y-2=