已知x>y>0,求x2+4y(x−y)
已知x>y>0,求x2+4y(x−y)
已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y
已知x2+y2-2x+4y+5=0,求(x^4-y^4)/(2x^2+xy-y^2)·[(2x-y)/(xy-y^2)]
已知x2+y2=25,x+y=7,且x>y,求x-y.
已知:x2+4x+y2-6y+13=0,求(x-2y)/(x²+y²)
已知x2+4y2-4x-4y+5=0,求x-y的值,
已知x2+4x+y2-2y+5=0,求x,y的值.
已知 x2 +y2 -2x+4y =0 ,求 x-2y 最大值
已知x2+y2-6x+4y+13=0,求2x+3y
已知x2-4x+y2+6y+13=0,求x-y的值
已知x2+y2-10x-6y+34=0,求y\x+y的值
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,