| ( | ( | ( | ( | 100 | × | 19 20 | ) | × | 19 20 | ) | × | 19 20 | ) | × | 19 20 | ) | x | = | 100 |
| 方程左边 = | ( | ( | ( | 100 | × | 19 20 | ) | × | 19 20 | ) | × | 19 20 | ) | × | 19 20 | x |
| = | ( | ( | 100 | × | 19 20 | ) | × | 19 20 | ) | × | 19 20 | × | 19 20 | x |
| = | ( | ( | 100 | × | 19 20 | ) | × | 19 20 | ) | × | 361 400 | x |
| = | ( | 100 | × | 19 20 | ) | × | 19 20 | × | 361 400 | x |
| = | ( | 100 | × | 19 20 | ) | × | 6859 8000 | x |
| = | 100 | × | 19 20 | × | 6859 8000 | x |
| = | 130321 1600 | x |
130321 1600 | x | = | 100 |
| x | = | 100 | ÷ | 130321 1600 |
| = | 100 | × | 1600 130321 |
| x | = | 160000 130321 |
| x | = | 1.227738 |