详细信息: 输入的方程组为:
| | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (1) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (2) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (3) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (4) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (5) |
| 解题过程:
用第 (2) 式两边同时 减去 第 (1) 等式两边,方程组化为:
| | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (1) |
| | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (3) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (4) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (5) |
|
用第 (3) 式两边同时 减去 第 (1) 等式两边,方程组化为:
| | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (1) |
| | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (4) |
| | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (5) |
|
用第 (4) 式两边同时 减去 第 (1) 等式两边,方程组化为:
| | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (1) |
| | | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (5) |
|
用第 (5) 式两边同时 减去 第 (1) 等式两边,方程组化为:
| | | | | 199 100 | A | + | | | 299 100 | B | + | | | 399 100 | C | + | | | 199 100 | D | + | | 10 | E | = | | 0 | | (1) |
| | | | |
将未知数的系数化为1,方程组化为:
| | | | A | + | | | 299 199 | B | + | | | 399 199 | C | + | | D | + | | | 1000 199 | E | = | | 0 | | (1) |
| | | | |
所以,方程组的解为:
| | | A = | - | | 299 199 | B | - | | | 399 199 | C | - | | | 199 199 | D | - | | | 1000 199 | E |
|
其中: B, C, D, E 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》 |