详细信息: 输入的方程组为:
| | | | 4 | A | + | | 4 | B | + | | 4 | C | + | | 2 | D | + | | 2 | E | + | | F | = | | 0 | | (1) |
| | 16 | A | + | | 16 | B | + | | 24 | C | + | | 4 | D | + | | 6 | E | + | | F | = | | 0 | | (2) |
| | 16 | A | + | | 4 | B | + | | 8 | C | + | | 4 | D | + | | 2 | E | + | | F | = | | 0 | | (3) |
| | | | 解题过程:
将第 (1) 等式两边 乘以4后,可以得到等式: | | 16 | A | + | | 16 | B | + | | 16 | C | + | | 8 | D | + | | 8 | E | + | | 4 | F | = | | 0 | (7) | ,然后再同时用第 (2) 等式两边 减去 等式(7)两边,方程组化为:
| | | | 4 | A | + | | 4 | B | + | | 4 | C | + | | 2 | D | + | | 2 | E | + | | F | = | | 0 | | (1) |
| | | 16 | A | + | | 4 | B | + | | 8 | C | + | | 4 | D | + | | 2 | E | + | | F | = | | 0 | | (3) |
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将第 (1) 等式两边 乘以4后,可以得到等式: | | 16 | A | + | | 16 | B | + | | 16 | C | + | | 8 | D | + | | 8 | E | + | | 4 | F | = | | 0 | (8) | ,然后再同时用第 (3) 等式两边 减去 等式(8)两边,方程组化为:
| | | | 4 | A | + | | 4 | B | + | | 4 | C | + | | 2 | D | + | | 2 | E | + | | F | = | | 0 | | (1) |
| | -12 | B | | -8 | C | | -4 | D | | -6 | E | | -3 | F | = | | 0 | | (3) |
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交换第(2)和第(3)式后,方程组化为:
| | | | 4 | A | + | | 4 | B | + | | 4 | C | + | | 2 | D | + | | 2 | E | + | | F | = | | 0 | | (1) |
| -12 | B | | -8 | C | | -4 | D | | -6 | E | | -3 | F | = | | 0 | | (2) |
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用第 (2) 式两边同时 加上 第 (3) 等式两边,方程组化为:
| | | | 4 | A | + | | 4 | B | + | | 4 | C | + | | 2 | D | + | | 2 | E | + | | F | = | | 0 | | (1) |
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将第 (3) 等式两边 除以2后,可以得到等式:,然后再同时用第 (1) 等式两边 减去 等式(9)两边,方程组化为:
| | | | 4 | A | + | | 4 | B | + | | 4 | D | + | | 3 | E | + | | | 5 2 | F | = | | 0 | | (1) |
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将第 (2) 等式两边 除以3后,可以得到等式: | -4 | B | | - | 8 3 | D | | - | 8 3 | E | | -2 | F | = | | 0 | (10) | ,然后再同时用第 (1) 等式两边 加上 等式(10)两边,方程组化为:
| | | | 4 | A | + | | | 4 3 | D | + | | | 1 3 | E | + | | | 1 2 | F | = | | 0 | | (1) |
| | | C | | - | 1 2 | D | | - | 1 4 | E | | - | 3 8 | F | = | | 0 | | (3) |
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将未知数的系数化为1,方程组化为:
| | | | A | + | | | 1 3 | D | + | | | 1 12 | E | + | | | 1 8 | F | = | | 0 | | (1) |
| | B | + | | | 2 3 | D | + | | | 2 3 | E | + | | | 1 2 | F | = | | 0 | | (2) |
| | C | | - | 1 2 | D | | - | 1 4 | E | | - | 3 8 | F | = | | 0 | | (3) |
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所以,方程组的解为:
其中: D, E, F 为任意常数。 解方程组的详细方法请参阅:《多元一次方程组的解法》 |