| 118320 | ( | m | − | 1 | ) | ( | 1 | + | 2 | + | 3 | + | m | ) | ÷ | 780000 | × | m | = | 0 |
| 方程左边 = | 493 3250 | ( | m | − | 1 | ) | ( | 1 | + | 2 | + | 3 | + | m | ) | m |
493 3250 | ( | m | − | 1 | ) | ( | 1 | + | 2 | + | 3 | + | m | ) | m | = | 0 |
| 方程左边 = | 493 3250 | m | ( | 1 | + | 2 | + | 3 | + | m | ) | m | − | 493 3250 | × | 1 | ( | 1 | + | 2 | + | 3 | + | m | ) | m |
| = | 493 3250 | m | ( | 1 | + | 2 | + | 3 | + | m | ) | m | − | 493 3250 | ( | 1 | + | 2 | + | 3 | + | m | ) | m |
| = | 493 3250 | m | × | 1 | m | + | 493 3250 | m | × | 2 | m | + | 493 3250 | m | × | 3 | m |
| = | 493 3250 | m | m | + | 493 1625 | m | m | + | 1479 3250 | m | m | + | 493 3250 | m | m |
| = | 493 3250 | m | m | + | 493 1625 | m | m | + | 1479 3250 | m | m | + | 493 3250 | m | m |
| = | 493 3250 | m | m | + | 493 1625 | m | m | + | 1479 3250 | m | m | + | 493 3250 | m | m |
| = | 493 3250 | m | m | + | 493 1625 | m | m | + | 1479 3250 | m | m | + | 493 3250 | m | m |
493 3250 | m | m | + | 493 1625 | m | m | + | 1479 3250 | m | m | + | 493 3250 | m | m | = | 0 |