| 1 | ÷ | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) | × | I | − | 3 | = | ( | 1 50 | − | I | ) | × | 8400 | ÷ | 43 |
| 方程两边同时乘以: | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) | = | ( | 1 50 | − | I | ) | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | × | 1 | ÷ | 510 | − | 3 | × | 1 | ÷ | 510 | = | ( | 1 50 | − | I | ) | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | × | 1 | ÷ | 510 | − | 3 | × | 1 | ÷ | 510 | = | 1 50 | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 170 | − | 1 170 | = | 168 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 85 | = | 168 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 85 | = | 168 43 | × | 1 | ÷ | 510 | + | 168 43 | × | 1 | ÷ | 510 | − | I | × | 8400 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 85 | = | 28 3655 | + | 28 3655 | − | I | × | 8400 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 85 | = | 56 3655 | − | I | × | 8400 43 | ( | 1 | ÷ | 510 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 85 | = | 56 3655 | − | I | × | 8400 43 | × | 1 | ÷ | 510 | − | I | × | 8400 43 | × | 1 | ÷ | 510 |
| 1 | I | − | 1 85 | = | 56 3655 | − | I | × | 280 731 | − | I | × | 280 731 |
| 1 | I | − | 1 85 | = | 56 3655 | − | 560 731 | I |
| 1 | I | + | 560 731 | I | = | 56 3655 | + | 1 85 |
1291 731 | I | = | 56 3655 | + | 1 85 |
1291 731 | I | = | 99 3655 |
| I | = | 99 3655 | ÷ | 1291 731 |
| = | 99 3655 | × | 731 1291 |
| = | 99 5 | × | 1 1291 |
| I | = | 99 6455 |
| I | = | 0.015337 |