若x+y+3=0,求2/3-2x-2y+(-x-y)^2
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若2x-3y=0,求5x+4y/3x-2y
若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?
若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x
若2x平方+3xy-2y平方=0,求x+y/x-y
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x^2-3y^2=2xy(x>0,y>0),求代数式x+2y/x-y