| 20000 | − | 3000 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | − | X | ÷ | ( | 1 | + | 13 100 | ) | = | 20000 | − | 3000 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | − | X | ÷ | ( | 1 | + | 3 100 | ) |
| 方程两边同时乘以: | ( | 1 | + | 13 100 | ) | , | ( | 1 | + | 3 100 | ) |
| 20000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20000 | × | 1 | ( | 1 | + | 3 100 | ) | + | 20000 | × | 13 100 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | = | 20000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20000 | × | 1 | ( | 1 | + | 3 100 | ) | + | 20000 | × | 13 100 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | = | 20000 | × | 1 | ( | 1 | + | 3 100 | ) | + | 20000 | × | 13 100 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) |
| 20000 | ( | 1 | + | 3 100 | ) | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | = | 20000 | ( | 1 | + | 3 100 | ) | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X |
| 20000 | × | 1 | + | 20000 | × | 3 100 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | = | 20000 | ( | 1 | + | 3 100 | ) | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X |
| 20000 | × | 1 | + | 20000 | × | 3 100 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | = | 20000 | × | 1 | + | 20000 | × | 3 100 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) |
| 20000 | + | 600 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | = | 20000 | + | 600 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X |
| 20600 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20600 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20600 | + | 2600 | × | 1 | + | 2600 | × | 3 100 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | = | 20600 | + | 2600 | ( | 1 | + | 3 100 | ) | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20600 | + | 2600 | × | 1 | + | 2600 | × | 3 100 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | = | 20600 | + | 2600 | × | 1 | + | 2600 | × | 3 100 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) |
| 20600 | + | 2600 | + | 78 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20600 | + | 2600 | + | 78 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 23278 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 23278 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 23278 | − | 3000 | × | 1 | ( | 1 | + | 3 100 | ) | − | 3000 | × | 13 100 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | = | 23278 | − | 3000 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 23278 | − | 3000 | × | 1 | ( | 1 | + | 3 100 | ) | − | 3000 | × | 13 100 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | = | 23278 | − | 3000 | × | 1 | ( | 1 | + | 3 100 | ) | − | 3000 | × | 13 100 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X |
| 23278 | − | 3000 | ( | 1 | + | 3 100 | ) | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 23278 | − | 3000 | ( | 1 | + | 3 100 | ) | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 23278 | − | 3000 | × | 1 | − | 3000 | × | 3 100 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | = | 23278 | − | 3000 | ( | 1 | + | 3 100 | ) | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 23278 | − | 3000 | × | 1 | − | 3000 | × | 3 100 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | = | 23278 | − | 3000 | × | 1 | − | 3000 | × | 3 100 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X |
| 23278 | − | 3000 | − | 90 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 23278 | − | 3000 | − | 90 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20188 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20188 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20188 | − | 390 | × | 1 | − | 390 | × | 3 100 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20188 | − | 390 | ( | 1 | + | 3 100 | ) | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20188 | − | 390 | × | 1 | − | 390 | × | 3 100 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20188 | − | 390 | × | 1 | − | 390 | × | 3 100 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
| 20188 | − | 390 | − | 117 10 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 13 100 | ) | × | 13 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 3 100 | ) | = | 20188 | − | 390 | − | 117 10 | − | ( | 2600 | − | X | ÷ | ( | 1 | + | 3 100 | ) | × | 3 100 | ) | × | 12 100 | ( | 1 | + | 13 100 | ) | ( | 1 | + | 3 100 | ) | − | X | ( | 1 | + | 13 100 | ) |
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