| 140 | = | ( | 1 | + | ( | 1 2 | × | 1 2 | ) | ÷ | ( | 113 100 | x | × | 113 100 | x | ) | × | 2 | ) | × | 120 |
| 140 | = | 1 | × | 120 | + | ( | 1 2 | × | 1 2 | ) | ÷ | ( | 113 100 | x | × | 113 100 | x | ) | × | 2 | × | 120 |
| 140 | = | 120 | + | ( | 1 2 | × | 1 2 | ) | ÷ | ( | 113 100 | x | × | 113 100 | x | ) | × | 240 |
| 方程两边同时乘以: | ( | 113 100 | x | × | 113 100 | x | ) |
| 140 | ( | 113 100 | x | × | 113 100 | x | ) | = | 120 | ( | 113 100 | x | × | 113 100 | x | ) | + | ( | 1 2 | × | 1 2 | ) | × | 240 |
| 140 | × | 113 100 | x | × | 113 100 | x | = | 120 | ( | 113 100 | x | × | 113 100 | x | ) | + | ( | 1 2 | × | 1 2 | ) | × | 240 |
| 140 | × | 113 100 | x | × | 113 100 | x | = | 120 | × | 113 100 | x | × | 113 100 | x | + | ( | 1 2 | × | 1 2 | ) | × | 240 |
89383 500 | x | x | = | 38307 250 | x | x | + | ( | 1 2 | × | 1 2 | ) | × | 240 |
89383 500 | x | x | = | 38307 250 | x | x | + | 1 2 | × | 1 2 | × | 240 |
89383 500 | x | x | = | 38307 250 | x | x | + | 60 |