x2+2y^2-2x+4y^2=-3 求(x+y)^2005
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
A={y|y=x2-4x+6,y属于N},B={y|y=-x2-2x+18,y属于N},求A交B.
已知x2+y2-6x+4y+13=0,求2x+3y
正整数x,y满足x2-y2=2xy,求x-y/x+y的值
整数x,y满足x2-y2=2xy,求x-y/x+y的值
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)
若实数x,y满足(x+2y-2)(3x+2y+2)+2(x2+4)=0,求x+y的值.
已知x2-4x-1=0,求代数式(2x-3)2-(x+y)(x-y)-y2的值
已知x2+y2-2x+4y+5=0,求(x^4-y^4)/(2x^2+xy-y^2)·[(2x-y)/(xy-y^2)]
求函数y=根号2x2-3x+4+根号x2-2x的最小值