| ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | × | 1 5 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | × | 1 5 | = | 243332 25 |
| 方程左边 = | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | × | 1 25 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | × | 1 25 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | = | 243332 25 |
| 方程左边 = | ( | X | − | 160 | ) | ÷ | 4 5 | × | 1 25 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 800 | × | 1 25 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | ( | X | − | 160 | ) | × | 1 20 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 20 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 160 | × | 1 20 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 20 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 8 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 20 | ( | X | − | 160 | ) | ÷ | 4 5 | − | X | × | 1 20 | × | 800 | − | 8 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | ( | X | − | 160 | ) | − | X | × | 40 | − | 8 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | X | × | 1 16 | × | 160 | − | 40 | X | − | 8 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | X | × | 10 | − | 40 | X | − | 8 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 50 | X | − | 8 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 50 | X | − | 8 | ( | X | − | 160 | ) | ÷ | 4 5 | + | 8 | × | 800 | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 50 | X | − | 10 | ( | X | − | 160 | ) | + | 6400 | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 50 | X | − | 10 | X | + | 10 | × | 160 | + | 6400 | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 50 | X | − | 10 | X | + | 1600 | + | 6400 | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 60 | X | + | 8000 | − | 32 | ( | ( | X | − | 160 | ) | ÷ | 4 5 | − | 800 | ) |
| = | X | × | 1 16 | X | − | 60 | X | + | 8000 | − | 32 | ( | X | − | 160 | ) | ÷ | 4 5 | + | 32 | × | 800 |
| = | X | × | 1 16 | X | − | 60 | X | + | 8000 | − | 40 | ( | X | − | 160 | ) | + | 25600 |
| = | X | × | 1 16 | X | − | 60 | X | + | 33600 | − | 40 | ( | X | − | 160 | ) |
| = | X | × | 1 16 | X | − | 60 | X | + | 33600 | − | 40 | X | + | 40 | × | 160 |
| = | X | × | 1 16 | X | − | 60 | X | + | 33600 | − | 40 | X | + | 6400 |
| = | X | × | 1 16 | X | − | 100 | X | + | 40000 |
| X | × | 1 16 | X | − | 100 | X | + | 40000 | = | 243332 25 |