| 1742 | = | 2 | ( | 450 | − | 40 | ) | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| 方程右边 = | 2 | × | 450 | x | − | 2 | × | 40 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 900 | x | − | 80 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 820 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 820 | x | + | 2 | × | 450 | x | − | 2 | × | 40 | x | − | 2 | × | 2 | x | x |
| = | 820 | x | + | 900 | x | − | 80 | x | − | 4 | x | x |
| = | 1640 | x | − | 4 | x | x |
| 1742 | = | 1640 | x | − | 4 | x | x |
| 882 | = | 2 | ( | 450 | − | 40 | ) | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| 方程右边 = | 2 | × | 450 | x | − | 2 | × | 40 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 900 | x | − | 80 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 820 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 820 | x | + | 2 | × | 450 | x | − | 2 | × | 40 | x | − | 2 | × | 2 | x | x |
| = | 820 | x | + | 900 | x | − | 80 | x | − | 4 | x | x |
| = | 1640 | x | − | 4 | x | x |
| 882 | = | 1640 | x | − | 4 | x | x |
| 603 | = | 2 | ( | 450 | − | 40 | ) | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| 方程右边 = | 2 | × | 450 | x | − | 2 | × | 40 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 900 | x | − | 80 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 820 | x | + | 2 | ( | 450 | − | 40 | − | 2 | x | ) | x |
| = | 820 | x | + | 2 | × | 450 | x | − | 2 | × | 40 | x | − | 2 | × | 2 | x | x |
| = | 820 | x | + | 900 | x | − | 80 | x | − | 4 | x | x |
| = | 1640 | x | − | 4 | x | x |
| 603 | = | 1640 | x | − | 4 | x | x |