| 5 | ÷ | 102 | + | 10 | ÷ | 447 10 | + | X | ÷ | 255 2 | + | ( | 402 5 | − | X | ) | ÷ | 1000 | + | 2 | ÷ | 6679 50 | = | 921 2000 |
| 方程左边 = | 5 102 | + | 100 447 | + | X | × | 2 255 | + | ( | 402 5 | − | X | ) | × | 1 1000 | + | 100 6679 |
| = | 29204255 101507442 | + | 2 255 | X | + | ( | 402 5 | − | X | ) | × | 1 1000 |
29204255 101507442 | + | 2 255 | X | + | ( | 402 5 | − | X | ) | × | 1 1000 | = | 921 2000 |
| 方程左边 = | 29204255 101507442 | + | 2 255 | X | + | 402 5 | × | 1 1000 | − | X | × | 1 1000 |
| = | 29204255 101507442 | + | 2 255 | X | + | 201 2500 | − | X | × | 1 1000 |