已知|3-y|+|x+y|=0,求x+yxy
已知|3-y|+|x+y|=0,求x+yxy
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
若正数x,y满足2x+y-3=0,则x+2yxy的最小值为( )
已知x和y满足2x+3y=5,则当x=4时,代数式3(xXx)+12xy+(yXy)的值是( )
X+y=4,Xy=-12 求(1)XxX+yxy (2)XxXxy+Xxyxy
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
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)
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知2x+3y=2(x>0,y>0),求x+y最大值