已知实数x,y满足x^2+3y^2+6x-12y+21=0,求x,y的值

已知实数x,y满足2x+5y>=10;2x-3y>-6;2x+y 已知实数X,Y满足2 已知实数xy满足x+2y 已知实数xy满足 x+y-2 已知实数x.y满足(x+2)^2+y^2( 已知实数x,y满足x-y 已知实数X,Y满足{|x+y| 已知实数x,y满足约束条件x+y>3,y 已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x. 已知实数x,y满足3^x=6,2*3^y=3,那么x+y= 已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知实数x,y满足x=√(9-x+2y)+√(3x-6y-27)+5,则-2x-y的立方根为 已知实数x y满足x^3-6x^2-4=0,y^3-3y^2-9y-9=0求x-y 已知实数x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值 已知实数x,y满足y=x^2+5x-4,则3x-2y最大值为 已知实数x,y满足x^2+3X+y-3=0,则x+y的最大值为 已知实数x,y满足x²-x+y=2,则3x-y的最小值为_______. 已知实数x,y满足不等式组：2x-y=0,x+2y