实数x.y满足x^2+y^2-6x-9y+12=0,则y/x的最大值为急急

已知实数x.y满足(x+2)^2+y^2( 已知实数x,y满足2x+5y>=10;2x-3y>-6;2x+y 实数x,y满足2x+5y>=0,2x-3y>=-6,2x+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,z满足x=6-y,z^2=xy-9,求证：x=y 已知实数x,y,z,满足那么x+y=6,z^2=xy-9,求(x+y)^z 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,y满足x-y 已知实数X,Y满足{|x+y| 实数x,y满足:｜x+y｜ 设实数x,y满足 x>=0 x-2y>=0 x-y-2 设实数x,y满足约束条件：x>=2;y>=x;2x+y 当实数x,y,满足约束条件{x>0 y>=x 2x+y+k 实数X,Y满足（2X－3Y）^2+X^2+6X+9=0,则Y=?(X-Y)^2009=? 已知实数x,y满足x=√(9-x+2y)+√(3x-6y-27)+5,则-2x-y的立方根为