| ( | 1 | + | 1 50 | ) | × | 1000 | ( | 1 | − | 1 100 | ) | + | 2000 | × | 100 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) | = | 1000 | × | 100 | + | 2000 | × | 150 |
| 方程左边 = | ( | 1 | + | 1 50 | ) | × | 1000 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| ( | 1 | + | 1 50 | ) | × | 1000 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) | = | 1000 | × | 100 | + | 2000 | × | 150 |
| 方程左边 = | 1 | × | 1000 | ( | 1 | − | 1 100 | ) | + | 1 50 | × | 1000 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 1000 | ( | 1 | − | 1 100 | ) | + | 20 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 1000 | × | 1 | − | 1000 | × | 1 100 | + | 20 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 1000 | − | 10 | + | 20 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 990 | + | 20 | ( | 1 | − | 1 100 | ) | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 990 | + | 20 | × | 1 | − | 20 | × | 1 100 | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 990 | + | 20 | − | 1 5 | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 5049 5 | + | 200000 | ( | 1 | + | 1 100 | a | ) | ( | 1 | − | 1 100 | a | ) |
| = | 5049 5 | + | 200000 | × | 1 | ( | 1 | − | 1 100 | a | ) | + | 200000 | × | 1 100 | a | ( | 1 | − | 1 100 | a | ) |
| = | 5049 5 | + | 200000 | ( | 1 | − | 1 100 | a | ) | + | 2000 | a | ( | 1 | − | 1 100 | a | ) |
| = | 5049 5 | + | 200000 | × | 1 | − | 200000 | × | 1 100 | a | + | 2000 | a | ( | 1 | − | 1 100 | a | ) |
| = | 5049 5 | + | 200000 | − | 2000 | a | + | 2000 | a | ( | 1 | − | 1 100 | a | ) |
| = | 1005049 5 | − | 2000 | a | + | 2000 | a | ( | 1 | − | 1 100 | a | ) |
| = | 1005049 5 | − | 2000 | a | + | 2000 | a | × | 1 | − | 2000 | a | × | 1 100 | a |
| = | 1005049 5 | − | 2000 | a | + | 2000 | a | − | 20 | a | a |
| = | 1005049 5 | − | 0 | a | − | 20 | a | a |
1005049 5 | − | 20 | a | a | = | 1000 | × | 100 | + | 2000 | × | 150 |
| 方程右边 = | 100000 | + | 300000 |
| = | 400000 |
1005049 5 | − | 20 | a | a | = | 400000 |