157 50 | × | 100 | ( | X | X | + | 50 | × | 50 | + | X | × | 50 | ) | = | 1020500 | ÷ | 3 |
| 方程左边 = | 314 | ( | X | X | + | 50 | × | 50 | + | X | × | 50 | ) |
| 314 | ( | X | X | + | 50 | × | 50 | + | X | × | 50 | ) | = | 1020500 | ÷ | 3 |
| 方程左边 = | 314 | X | X | + | 314 | × | 50 | × | 50 | + | 314 | X | × | 50 |
| = | 314 | X | X | + | 785000 | + | 15700 | X |
| 314 | X | X | + | 785000 | + | 15700 | X | = | 1020500 | ÷ | 3 |
| 方程右边 = | 1020500 3 |
| 314 | X | X | + | 785000 | + | 15700 | X | = | 1020500 3 |