| 30 | ÷ | 255 2 | + | 10 | ÷ | 102 | + | 6 | ÷ | 447 10 | + | 8 | ÷ | 451 10 | + | ( | 161 5 | − | X | ) | ÷ | 6679 50 | + | X | ÷ | 1000 | = | 61 100 |
| 方程左边 = | 4 17 | + | 5 51 | + | 20 149 | + | 80 451 | + | ( | 161 5 | − | X | ) | × | 50 6679 | + | X | × | 1 1000 |
| = | 130019 201597 | + | ( | 161 5 | − | X | ) | × | 50 6679 | + | 1 1000 | X |
130019 201597 | + | ( | 161 5 | − | X | ) | × | 50 6679 | + | 1 1000 | X | = | 61 100 |
| 方程左边 = | 130019 201597 | + | 161 5 | × | 50 6679 | − | X | × | 50 6679 | + | 1 1000 | X |
| = | 130019 201597 | + | 1610 6679 | − | X | × | 50 6679 | + | 1 1000 | X |
| = | 1192968071 1346466363 | − | 43321 6679000 | X |
1192968071 1346466363 | − | 43321 6679000 | X | = | 61 100 |
| - | 43321 6679000 | X | = | 61 100 | − | 1192968071 1346466363 |