| ( | 40 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 80 100 | ) | × | 100 | × | 3 | × | 60 100 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 100 | × | 3 | × | 40 100 | ) | × | 1 2 | = | m |
| 方程左边 = | 40 | × | 1 2 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 80 100 | ) | × | 100 | × | 3 | × | 60 100 | × | 1 2 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 100 | × | 3 | × | 40 100 | × | 1 2 |
| = | 20 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 80 100 | ) | × | 90 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | 20 | + | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | × | 90 | − | 80 100 | × | 90 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | 20 | + | ( | 637 25 | − | 469 25 | ) | × | 2250 469 | − | 72 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | - | 52 | + | ( | 637 25 | − | 469 25 | ) | × | 2250 469 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | - | 52 | + | 637 25 | × | 2250 469 | − | 469 25 | × | 2250 469 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | - | 52 | + | 8190 67 | − | 90 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | - | 1324 67 | + | ( | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | − | 50 100 | ) | × | 60 |
| = | - | 1324 67 | + | ( | 637 25 | − | 469 25 | ) | ÷ | 469 25 | × | 60 | − | 50 100 | × | 60 |
| = | - | 1324 67 | + | ( | 637 25 | − | 469 25 | ) | × | 1500 469 | − | 30 |
| = | - | 3334 67 | + | ( | 637 25 | − | 469 25 | ) | × | 1500 469 |
| = | - | 3334 67 | + | 637 25 | × | 1500 469 | − | 469 25 | × | 1500 469 |
| = | - | 3334 67 | + | 5460 67 | − | 60 |
| = | - | 1894 67 |
| - | 1894 67 | = | m |
| - | m | = | 1894 67 |
| - | 1894 67 | = | m |
| m | = | - | 1894 67 |