3x-2y-39=0 5x+3y-84=0 求x,y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
|3x-y+5|+(2x-y+3)²=0 求x=?y=?
x-3y=0,求2X+5Y\3X-2Y
若2x-3y=0,求5x+4y/3x-2y
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知|3x-2y-39|+|5x+3y-84|=0,求4x+7y的平方根
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
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X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y