3x=5y,则x:y=( ):( )

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) 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y （5x+3y)(3y-5x)-(4x-y)(4y+x)= 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 已知3X=5Y,则X:Y= 若5x+3y=3x+4y=x+2y+6,则x+y=___ 3x-2y=2,5x+3y=-2,则x:y=( :) 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?