若x y满足x^2+y^2-2x+4y=0求x-2y的最大值

若x.y满足条件2x+y-12=0,x-4y+10 若x y满足x^2+y^2-2x+4y=0求x-2y的最大值 若x.y满足x^2+4x+y^2-10y+29=0.求x+y的值 若实数x,y满足x²+y²-2x+4y=0,求x-y的最大值 若变量x,y满足约束条件{x>=-1;y>=x;3x+2y 变量x,y满足x-2y=0,x 若x.y满足x+=4和x-y=2,求xy分之2x-y+1除以-x分之y+y分之x的值 化简求值：2(x+y)(x-2y)-2x(x+y),其中x、y满足x^2+y^2-2x+4y=-5 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 正数x,y满足x-y=2xy,求x-y/x+y的值. x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若实数x、y满足x平方+y平方-4x-2y+5=0,求根号8y-2x分之（根号x）+y 若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大值是多少 若实数X,Y满足x²+y²-4x-2y+5=0求√x+y/√8y-2x