| 120 | ÷ | ( | 1 | + | x% | ) | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | = | 1040 |
| 方程两边同时乘以: | ( | 1 | + | x% | ) |
| 120 | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | × | ( | 1 | + | x% | ) | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | = | 1040 | ( | 1 | + | x% | ) |
| 120 | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | × | 1 | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | × | x% | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | = | 1040 | ( | 1 | + | x% | ) |
| 120 | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | × | 1 | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | × | x% | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | = | 1040 | × | 1 | + | 1040 | × | x% |
| 120 | + | 120 | ÷ | ( | 1 | + | 2 | × | x% | ) | + | 6 5 | ÷ | ( | 1 | + | 2 | × | x% | ) | × | x | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | = | 1040 | + | 52 5 | x |
| 方程两边同时乘以: | ( | 1 | + | 2 | × | x% | ) |
| 120 | ( | 1 | + | 2 | × | x% | ) | + | 120 | + | 6 5 | x | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | ( | 1 | + | 2 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) |
| 120 | × | 1 | + | 120 | × | 2 | × | x% | + | 120 | + | 6 5 | x | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | ( | 1 | + | 2 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) |
| 120 | × | 1 | + | 120 | × | 2 | × | x% | + | 120 | + | 6 5 | x | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | × | 1 | + | 1040 | × | 2 | × | x% | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) |
| 120 | + | 12 5 | x | + | 120 | + | 6 5 | x | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 104 5 | x | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) |
| 240 | + | 18 5 | x | + | 1120 | ÷ | ( | 1 | + | 3 | × | x% | ) | × | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 104 5 | x | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) |
| 方程两边同时乘以: | ( | 1 | + | 3 | × | x% | ) |
| 240 | ( | 1 | + | 3 | × | x% | ) | + | 18 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 1120 | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | ( | 1 | + | 3 | × | x% | ) | + | 104 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | × | 1 | + | 240 | × | 3 | × | x% | + | 18 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 1120 | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | ( | 1 | + | 3 | × | x% | ) | + | 104 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | × | 1 | + | 240 | × | 3 | × | x% | + | 18 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 1120 | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | × | 1 | + | 1040 | × | 3 | × | x% | + | 104 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | + | 36 5 | x | + | 18 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 1120 | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 156 5 | x | + | 104 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | + | 36 5 | x | + | 18 5 | x | × | 1 | + | 18 5 | x | × | 3 | × | x% | + | 1120 | ( | 1 | + | x% | ) | = | 1040 | + | 156 5 | x | + | 104 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | + | 36 5 | x | + | 18 5 | x | × | 1 | + | 18 5 | x | × | 3 | × | x% | + | 1120 | ( | 1 | + | x% | ) | = | 1040 | + | 156 5 | x | + | 104 5 | x | × | 1 | + | 104 5 | x | × | 3 | × | x% | + | 52 5 | x |
| 240 | + | 36 5 | x | + | 18 5 | x | + | 27 250 | x | x | + | 1120 | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 156 5 | x | + | 104 5 | x | + | 78 125 | x | x | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | ( | 1 | + | x% | ) | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | × | 1 | ( | 1 | + | 2 | × | x% | ) | + | 1120 | × | x% | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | ( | 1 | + | 2 | × | x% | ) | ( | 1 | + | 3 | × | x% | ) |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | × | 1 | ( | 1 | + | 2 | × | x% | ) | + | 1120 | × | x% | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | × | 1 | ( | 1 | + | 3 | × | x% | ) | + | 52 5 | x |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | ( | 1 | + | 2 | × | x% | ) | + | 56 5 | x | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 26 125 | x | x |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | × | 1 | + | 1120 | × | 2 | × | x% | + | 56 5 | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | ( | 1 | + | 3 | × | x% | ) | + | 26 125 | x | x |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | × | 1 | + | 1120 | × | 2 | × | x% | + | 56 5 | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | × | 1 | + | 52 5 | x | × | 3 |
| 240 | + | 54 5 | x | + | 27 250 | x | x | + | 1120 | + | 112 5 | x | + | 56 5 | x | ( | 1 | + | 2 | × | x% | ) | = | 1040 | + | 52 | x | + | 78 125 | x | x | + | 52 5 | x | + | 39 125 | x | x | + | 26 125 |