| ( | 4 5 | − | x | ) | × | 4 | + | ( | 9 10 | − | x | ) | × | 4 | + | ( | 1 | − | x | ) | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 | = | 1239 1250 |
| 方程左边 = | 4 5 | × | 4 | − | x | × | 4 | + | ( | 9 10 | − | x | ) | × | 4 | + | ( | 1 | − | x | ) | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 16 5 | − | x | × | 4 | + | ( | 9 10 | − | x | ) | × | 4 | + | ( | 1 | − | x | ) | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 16 5 | − | 4 | x | + | 9 10 | × | 4 | − | x | × | 4 | + | ( | 1 | − | x | ) | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) |
| = | 16 5 | − | 4 | x | + | 18 5 | − | x | × | 4 | + | ( | 1 | − | x | ) | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 34 5 | − | 8 | x | + | ( | 1 | − | x | ) | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 34 5 | − | 8 | x | + | 1 | × | 2 | − | x | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 34 5 | − | 8 | x | + | 2 | − | x | × | 2 | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 44 5 | − | 10 | x | + | ( | 49 50 | − | x | ) | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 44 5 | − | 10 | x | + | 49 50 | × | 2 | − | x | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 44 5 | − | 10 | x | + | 49 25 | − | x | × | 2 | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 269 25 | − | 12 | x | + | ( | 19 20 | − | x | ) | × | 6 |
| = | 269 25 | − | 12 | x | + | 19 20 | × | 6 | − | x | × | 6 |
| = | 269 25 | − | 12 | x | + | 57 10 | − | x | × | 6 |
| = | 823 50 | − | 18 | x |
823 50 | − | 18 | x | = | 1239 1250 |
| - | 18 | x | = | 1239 1250 | − | 823 50 |
| - | 18 | x | = | - | 9668 625 |
9668 625 | = | 18 | x |
| 18 | x | = | 9668 625 |
| x | = | 9668 625 | ÷ | 18 |
| = | 9668 625 | × | 1 18 |
| = | 4834 625 | × | 1 9 |
| x | = | 4834 5625 |
| x | = | 0.859378 |