| ( | 1 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ÷ | ( | x | + | 1587 | ) | ) | ÷ | ( | 1 | + | ( | 139 50 | x | ) | ÷ | ( | x | + | 1400 | ) | ) | = | 28 25 |
| 方程两边同时乘以: | ( | 1 | + | ( | 139 50 | x | ) | ÷ | ( | x | + | 1400 | ) | ) |
| ( | 1 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ÷ | ( | x | + | 1587 | ) | ) | = | 28 25 | ( | 1 | + | ( | 139 50 | x | ) | ÷ | ( | x | + | 1400 | ) | ) |
| 1 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ÷ | ( | x | + | 1587 | ) | = | 28 25 | ( | 1 | + | ( | 139 50 | x | ) | ÷ | ( | x | + | 1400 | ) | ) |
| 1 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ÷ | ( | x | + | 1587 | ) | = | 28 25 | × | 1 | + | 28 25 | ( | 139 50 | x | ) | ÷ | ( | x | + | 1400 | ) |
| 1 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ÷ | ( | x | + | 1587 | ) | = | 28 25 | + | 28 25 | ( | 139 50 | x | ) | ÷ | ( | x | + | 1400 | ) |
| 方程两边同时乘以: | ( | x | + | 1587 | ) | , | ( | x | + | 1400 | ) |
| 1 | ( | x | + | 1587 | ) | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | ( | x | + | 1587 | ) | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | ( | x | + | 1400 | ) | + | 1 | × | 1587 | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | ( | x | + | 1587 | ) | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | ( | x | + | 1400 | ) | + | 1 | × | 1587 | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | ( | x | + | 1400 | ) | + | 28 25 | × | 1587 | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | ( | x | + | 1400 | ) | + | 1587 | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | ( | x | + | 1400 | ) | + | 44436 25 | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 1 | x | × | 1400 | + | 1587 | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | ( | x | + | 1400 | ) | + | 44436 25 | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 1 | x | × | 1400 | + | 1587 | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 28 25 | x | × | 1400 | + | 44436 25 | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 1400 | x | + | 1587 | ( | x | + | 1400 | ) | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 1568 | x | + | 44436 25 | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 1400 | x | + | 1587 | x | + | 1587 | × | 1400 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 1568 | x | + | 44436 25 | ( | x | + | 1400 | ) | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 1400 | x | + | 1587 | x | + | 1587 | × | 1400 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 1568 | x | + | 44436 25 | x | + | 44436 25 | × | 1400 | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 1400 | x | + | 1587 | x | + | 2221800 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 1568 | x | + | 44436 25 | x | + | 2488416 | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | ( | 139 50 | ( | x | + | 187 | ) | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | ( | x | + | 187 | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 28 25 | ( | 139 50 | x | ) | ( | x | + | 1587 | ) |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | ( | x | + | 187 | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 28 25 | × | 139 50 | x | ( | x | + | 1587 | ) |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | ( | x | + | 187 | ) | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 1946 625 | x | ( | x | + | 1587 | ) |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | x | ( | x | + | 1400 | ) | + | 139 50 | × | 187 | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 1946 625 | x | ( | x | + | 1587 | ) |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | x | ( | x | + | 1400 | ) | + | 139 50 | × | 187 | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 1946 625 | x | x | + | 1946 625 | x | × | 1587 |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | x | ( | x | + | 1400 | ) | + | 25993 50 | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 83636 25 | x | + | 2488416 | + | 1946 625 | x | x | + | 3088302 625 | x |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | x | ( | x | + | 1400 | ) | + | 25993 50 | ( | x | + | 1400 | ) | = | 28 25 | x | x | + | 5179202 625 | x | + | 2488416 | + | 1946 625 | x | x |
| 1 | x | x | + | 2987 | x | + | 2221800 | + | 139 50 | x | x | + | 139 50 | x | × | 1400 | = | 28 25 | x | x | + | 5179202 625 | x | + | 2488416 | + | 1946 625 | x | x |