若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
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
若x,y互为相反数(y≠0),则2x+5+2y+3x/y=____
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
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-5y=0(y≠0),则代数式2x-3y/3x+6y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
若实数x,y满足x的平方+y的平方-4x-2y+5=0,则(x+y)/2x-3=