1 2 | ( | 331 50 | − | x | ) | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) | = | 650 | × | 1 4 |
| 方程左边 = | 1 2 | × | 331 50 | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 331 100 | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 331 100 | ( | 9 | − | x | ) | × | 441 50 | − | 331 100 | × | 21 | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 145971 5000 | ( | 9 | − | x | ) | − | 6951 100 | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 145971 5000 | × | 9 | − | 145971 5000 | x | − | 6951 100 | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 1313739 5000 | − | 145971 5000 | x | − | 6951 100 | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 966189 5000 | − | 145971 5000 | x | − | 1 2 | x | ( | ( | 9 | − | x | ) | × | 441 50 | − | 21 | ) |
| = | 966189 5000 | − | 145971 5000 | x | − | 1 2 | x | ( | 9 | − | x | ) | × | 441 50 | + | 1 2 | x | × | 21 |
| = | 966189 5000 | − | 145971 5000 | x | − | 441 100 | x | ( | 9 | − | x | ) | + | 21 2 | x |
| = | 966189 5000 | − | 93471 5000 | x | − | 441 100 | x | ( | 9 | − | x | ) |
| = | 966189 5000 | − | 93471 5000 | x | − | 441 100 | x | × | 9 | + | 441 100 | x | x |
| = | 966189 5000 | − | 93471 5000 | x | − | 3969 100 | x | + | 441 100 | x | x |
| = | 966189 5000 | − | 291921 5000 | x | + | 441 100 | x | x |
966189 5000 | − | 291921 5000 | x | + | 441 100 | x | x | = | 650 | × | 1 4 |
| 方程右边 = | 325 2 |
966189 5000 | − | 291921 5000 | x | + | 441 100 | x | x | = | 325 2 |