x-y/13=y/7 x+y/y已知（x-y）/13=y/7则（X+Y）/Y=?

x-y/13=y/7 x+y/y已知（x-y）/13=y/7则（X+Y）/Y=? 已知；13分之X-Y=7分之Y,则Y分之X+Y=?谢 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x+y=6,xy=7,试求x*x+y*y,x*x-y*y的值 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 已知X+X+X+Y+Y=54,X+X+Y+Y+Y=56,那么X=( ),Y=( ) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简 x / y(x+y) - y / x(x+y) = 已知：4x = 5y,求(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,y满足y {(x,y) |x|+|y| x>y?x:y 已知x不等于y,且·x×x-x=13,y×y-y=13,求x+y-7的值 x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 已知5x=7y,则x:y=( )