已知x-y=3则5(x-y)-3x+3y-2=

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知3X=5Y,则X:Y= 已知x-y=3则5(x-y)-3x+3y-2= 已知x-y=3则5(x-y)-3x+3y-2= 已知5|x+y-3|+（x-y）²=0则x=,y= 已知x,y满足x+3y=5,3x+y=-1,则x-y=? 已知2x=3y,则y分之x=< >,y分之x+y=< >. （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知3x=8y,则x;y=? 已知|x+y-3|+(x-y)2=0则 比例线段：已知x/y=2/3,则 x/x+y= ,x-y/x+y= 要过程! 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值