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{x=>0,y 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x²+y²+4x-6y+13=0 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：y 已知实数x,y满足x-ay-1>=0,2x+y>=0,x 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x²+y²-xy+2x-y+1=0 求x y 已知实数x,y满足（x+y)(x+y+3)-4=0则x+y的值是 已知实数x,y满足约束条件x+y>3,y 已知实数x,y满足不等式2x-y>=0,x+y-4>=0,x 已知实数x,y满足不等式2x-y>=0,x+y-4>=0,x 已知实数x,y满足 2x+y-2>=0,x-2y+k>=0,x-1 已知实数想x,y满足条件x-y+5>=0 x+y>=0 x 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x的平方+3x+y-3=0,则x+y的最大值