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1. :
min L = 2x1 + x2 - x3;
2x2 - x3 ≤ 5;
x1 + x2 - x3 ≥ -1;
2x1 - x2 ≤ -3;
x1 ≤ 0; x2 ≥ 0; x3 ≥ 0.
x4, x5, x6. , x4, x6 "+", x5 "-".
2x2 - x3 + x4 = 5;
x1 + x2 - x3 - x5 = -1;
2x1 - x2 + x6 = -3;
x4 ≥ 0; x5 ≥ 0; x6 ≥ 0.
, -1:
2x2 - x3 + x4 = 5;
-x1 - x2 + x3 + x5 = 1;
-2x1 + x2 - x6 = 3.
, , . , x1 = x1' - x7, x1' ≥ 0, x7 ≥ 0.
, , , :
Lmin = 2x1' + x2 - x3 - 2x7;
2x2 - x3 + x4 = 5;
-x1' - x2 + x3 + x5 + x7 = 1;
-2x1' + x2 - x6 + 2x7 = 3;
x1' ≥ 0; xi ≥ 0, i=2, 3, 4, 5, 6, 7.
12) 1. .
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