| ( | 1560 | − | x | − | 1040 | ) | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) | = | 8400 |
| 方程左边 = | 1560 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | − | x | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | − | 1040 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 1560 | × | 3 | + | 1560 | x | ÷ | 40 | × | 2 | − | x | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | − | 1040 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 4680 | + | 78 | x | − | x | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | − | 1040 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 4680 | + | 78 | x | − | x | × | 3 | − | x | x | ÷ | 40 | × | 2 | − | 1040 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) |
| = | 4680 | + | 78 | x | − | x | × | 3 | − | x | x | × | 1 20 | − | 1040 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 4680 | + | 75 | x | − | x | x | × | 1 20 | − | 1040 | ( | 3 | + | x | ÷ | 40 | × | 2 | ) | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 4680 | + | 75 | x | − | x | x | × | 1 20 | − | 1040 | × | 3 | − | 1040 | x | ÷ | 40 | × | 2 |
| = | 4680 | + | 75 | x | − | x | x | × | 1 20 | − | 3120 | − | 52 | x | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 1560 | + | 23 | x | − | x | x | × | 1 20 | + | ( | 525 | × | 8 | ÷ | 10 | − | 280 | ) | ( | 20 | + | 10 | ) |
| = | 1560 | + | 23 | x | − | x | x | × | 1 20 | + | 525 | × | 8 | ÷ | 10 | × | ( | 20 | + | 10 | ) | − | 280 | ( | 20 | + | 10 | ) |
| = | 1560 | + | 23 | x | − | x | x | × | 1 20 | + | 420 | ( | 20 | + | 10 | ) | − | 280 | ( | 20 | + | 10 | ) |
| = | 1560 | + | 23 | x | − | x | x | × | 1 20 | + | 420 | × | 20 | + | 420 | × | 10 | − | 280 | ( | 20 | + | 10 | ) |
| = | 1560 | + | 23 | x | − | x | x | × | 1 20 | + | 8400 | + | 4200 | − | 280 | ( | 20 | + | 10 | ) |
| = | 14160 | + | 23 | x | − | x | x | × | 1 20 | − | 280 | ( | 20 | + | 10 | ) |
| = | 14160 | + | 23 | x | − | x | x | × | 1 20 | − | 280 | × | 20 | − | 280 | × | 10 |
| = | 14160 | + | 23 | x | − | x | x | × | 1 20 | − | 5600 | − | 2800 |
| = | 5760 | + | 23 | x | − | x | x | × | 1 20 |
| 5760 | + | 23 | x | − | x | x | × | 1 20 | = | 8400 |