求y=x^2(2-5x) (0
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
|3x-y+5|+(2x-y+3)²=0 求x=?y=?
x-3y=0,求2X+5Y\3X-2Y
已知x²+4x+y-2y+5=0求x+2y
若2x-3y=0,求5x+4y/3x-2y
已知x²+y²-2x+4y+5=0,求x+y
x平方+y平方-2x-4y+5=0求x,y的值.
已知x,y>0 2x+y+3=xy 求5x+4y最小值
x*x+4y*y+2x*x-4y+2=0求根号下5x*x+16y*y的值快啊