Математика. Курзина В.М - 29 стр.

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                                        29

           ⎧      x 2 + x3 + 2 x 4 = −3;                ⎧ 4 x 2 − x3 + 6 x 4 = −9;
           ⎪ 2 x + x + 2 x − x = 6;                     ⎪ x + 2 x + 3 x − 2 x = 6;
           ⎪      1      2     3      4                 ⎪ 1         2      3      4
 15.       ⎨                                    16.     ⎨
           ⎪ x1 − x 2 + 3 x3 − 2 x 4 = 10;              ⎪ x1 − x 2 + x3 − 2 x 4 = 5;
           ⎪⎩3 x1 + 2 x 2 − x3 + 4 x 4 = −15.           ⎪⎩3 x1 − 8 x 2 − x3 + 10 x 4 = 0.

          ⎧ 3 x1 + x 2 + x3 − 2 x 4 = 7;                    ⎧ x1 + 2 x 2 − x3 = 5;
 17.      ⎨                                      18.        ⎨
          ⎩2 x1 + x 2 − x3 + 2 x 4 = −4.                    ⎩2 x1 − x 2 + 2 x3 = −4.

          ⎧ x1 + x 2 + x3 + x 4 = 2;                        ⎧ x1 + 2 x 2 − 3x3 = 0;
          ⎪                                                 ⎪
 19.      ⎨2 x1 + 2 x 2 − x3 + 2 x 4 = −2;       20.        ⎨ 2 x1 − x 2 + x3 = 7;
          ⎪      x1 − x 2 − x 4 = 2.                        ⎪ x + 7 x − 10 x = 11.
          ⎩                                                 ⎩ 1      2       3


    ⎧ 6 x1 + 7 x 2 + 3 x3 − x 4 + 5 x5 = 8;              ⎧ 5 x1 − 6 x 2 + 4 x3 = 12;
21. ⎨                                            22. ⎨
    ⎩ x1 − 14 x 2 − 2 x3 + 12 x 4 − x5 = 10.             ⎩10 x1 − 12 x 2 − 8 x3 = 25.

    ⎧ 3x1 − 4 x 2 + 2 x3 − 5 x 4 = 20;                      ⎧4 x1 + 6 x 2 − 3 x5 = 16;
    ⎪                                                       ⎪
23. ⎨9 x1 + 2 x 2 − 6 x3 + 12 x 4 = 42;           24.       ⎨ 2 x 2 − x3 + x 4 = 20;
    ⎪ 6 x + 4 x − 3 x + 4 x = 16.                           ⎪ x + 7 x − 10 x = 10.
    ⎩ 1          2      3      4                            ⎩ 1       3        4


    ⎧    7 x1 − 2 x 2 − 3 x3 + x5 = 10;                       ⎧ x5 + 2 x 2 − 3 x3 = 12;
    ⎪                                                         ⎪
25. ⎨ 21x1 − 6 x 2 + 8 x3 − x 4 − 2 x5 = 22;          26.     ⎨ 2 x1 − x 4 + x 2 = 17;
    ⎪35 x + 7 x − 12 x + x − 3 x = 16.                        ⎪ x − 10 x − x = 15.
    ⎩ 1         2        3     4      5                       ⎩ 1         3     4


       ⎧9 x1 + 12 x 2 + 6 x3 − 12 x 4 = 30;                 ⎧ 3 x1 + 5 x 2 − x 4 = 8;
27. ⎨                                                 28. ⎨
       ⎩ 5 x1 + 4 x 2 − 3 x3 + 6 x 4 = −12.                 ⎩2 x1 − 4 x 2 + 2 x3 = −12.

       ⎧ 4 x1 − 5 x 2 + 2 x3 − 3 x 4 = 8;                   ⎧12 x1 + 20 x 2 − 8 x3 = 24;
29. ⎨                                                 30. ⎨
       ⎩5 x1 − 6 x 2 − x3 + 6 x 4 = −12.                    ⎩ 3 x1 − 5 x 2 + 9 x3 = −16.

    ⎧ 5 x1 + 5 x 2 + 2 x3 + 3 x 4 = 25;                   ⎧ x5 + 2 x 4 − 3 x1 = 42;
    ⎪                                                     ⎪
31. ⎨ 2 x1 + 3 x 2 − 4 x3 + 4 x 4 − x5 = 15;          32. ⎨ 2 x1 − 5 x 4 + 3 x 2 = 15;
    ⎪5 x − 6 x + 9 x − 2 x + 5 x = 32.                    ⎪3 x − 10 x − 6 x = 24.
    ⎩ 1        2       3      4       5                   ⎩ 1          3       4