已知实数x、y满足2x-y+1≥0,x-2y-1≤0,x+y≤1,求3x+4y绝对值的最大值

已知实数x,y满足x-ay-1>=0,2x+y>=0,x 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满足不等式组x≥0,y≥0,x+y≤1,则x^2+y^2-2x-2y的最小值 已知实数x,y满足条件x≥0,y≥x,3x+4y≤12,则(x+2y+3)/(x +1)的最大值是 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 已知实数x,y满足条件{2x-y+1≥0,2x+y≥0,x≤1,求z=x+3y的最小值. 已知实数x,y满足2x-y≤2,y≤x,y≥0,则（y-1)/(x+1)的最大值是? 已知实数x,y满足 2x+y-2>=0,x-2y+k>=0,x-1 已知实数x、y满足-1 已知实数x,y满足：1 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=>0,y 已知实数x,y满足{x=>0,y 已知实数x.y满足(x+2)^2+y^2( 已知实数x,y满足不等式组：2x-y=0,x+2y