| ( | 8505 | + | 115 | + | X | ) | ( | 268469 5000000 | + | 3 200 | ) | × | 1 | ÷ | 4 | = | X |
| 方程左边 = | ( | 8505 | + | 115 | + | X | ) | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 |
| ( | 8505 | + | 115 | + | X | ) | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 | = | X |
| 方程左边 = | 8505 | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 | + | 115 | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 | + | X | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 8505 4 | ( | 268469 5000000 | + | 3 200 | ) | + | 115 4 | ( | 268469 5000000 | + | 3 200 | ) | + | X | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 8505 4 | × | 268469 5000000 | + | 8505 4 | × | 3 200 | + | 115 4 | ( | 268469 5000000 | + | 3 200 | ) | + | X | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 456665769 4000000 | + | 5103 160 | + | 115 4 | ( | 268469 5000000 | + | 3 200 | ) | + | X | ( | 268469 5000000 | + | 3 200 | ) | × | 1 4 |