已知实数x,y满足{x≧0 y≧x 4x+3y≦12}.z=2y+3/x+1 的取值范围

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≧0 y≧x 4x+3y≦12}.z=2y+3/x+1 的取值范围 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x²+y²+4x-6y+13=0 已知实数x、y满足-4 已知实数x,y满足-4 已知实数x,y满足：y 已知实数x,y满足x+y≧0 x-y+4≧0 x≦1,则2x+y的最小值是?不会不等式怎已知实数x,y满足x+y≧0 x-y+4≧0 x≦1,则2x+y的最小值是?不会不等式怎么求最大值最小值. 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x-ay-1>=0,2x+y>=0,x 已知实数x,y满足方程x*x+y*y-4x+1=0.求y-x的最大值 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+2)^2+y^2(