（x-5y）/（y-2x)=3,则y:x=

若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) （x-5y）/（y-2x)=3,则y:x= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 先化简,再求值 [2/3x - 2/x+y（x+y/3x -x-y）]*x/x-y,其中5x+3y=0 若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（） 已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y）=-7}则(X+Y)(X-Y)= 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) （x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 x（x-2y）=y(2y-x) ,则y分之x是多少 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11