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-y 已知实数X,Y满足{|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满足约束条件:x>=2 y>=2 x+y 已知实数x,y满足{x=>0,y 已知实数x,y满足{x=>0,y 已知实数x,y满足不等式组：2x-y=0,x+2y 已知实数x,y满足x+y>=2,x-y 已知实数X,Y满足X+Y>=2,X-Y 已知实数x,y满足y=|x-1|,则x+2y的最大值是 已知实数x,y满足x+y>=2,x-y 已知实数x,y满足y=|x-1|若x+2y 已知实数x,y满足x-ay-1>=0,2x+y>=0,x 已知实数x,y满足 y=√x^2-4+√4-x^2分之x-2 +3 ,求9x+8y的值.