求解下列线性规划问题: (1)max z=x1+2x2, s.t.2x1+x2≤8, -x1+x2≤4, x1-x2≤0, 0≤x1≤3,x2≥0; (2)min f=
求解下列线性规划问题:
(1)max z=x1+2x2,
s.t.2x1+x2≤8,
-x1+x2≤4,
x1-x2≤0,
0≤x1≤3,x2≥0;
(2)min f=-3x1-11x2-9x3+x4+29x5,
s.t.x2+x3+x4-2x5≤4,
x1-x2+x3+2x4+x5≥0,
x1+x2+x3-3x5≤1,
x1无符号限制,xi≥0(j=2,3,4,5);
(3)max x=x1+6x2+4x3,
s.t.-x1+2x2+2x3≤13,
4x1-4x2+x3≤20,
x1+2x2+x3≤17,
x1≥1,x2≥2,x3≥3.