求解下列有界变量线性规划问题:
(1)min x0=3x1+4x2-2x3-5x4+3x5+2x6-x7,
s.t.x1+x4+2x5-x6+x7=13,
x2-x4+x5+x6+2x7=9,
x3+2x4+2x5+2x6-x7=5,
0≤xj≤5(j=1,2,…,7);
(2)min f=x1+2x2+x3-x4+2x5+x6-x7,
s.t.x1+2x4-2x5+x6-8x7=0,
x2+x4+x5-x6+x7=11,
x3+3x4-x5-2x6+2x7=6,
0≤xj≤4(j=1,2,…,7).
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