157 50 | × | 53 2 | x | ( | 47 4 | x | × | 47 4 | x | + | 37 4 | x | × | 37 4 | x | + | 37 4 | x | × | 47 4 | x | ) | ÷ | 3 | = | 3000 |
| 方程左边 = | 8321 300 | x | ( | 47 4 | x | × | 47 4 | x | + | 37 4 | x | × | 37 4 | x | + | 37 4 | x | × | 47 4 | x | ) |
8321 300 | x | ( | 47 4 | x | × | 47 4 | x | + | 37 4 | x | × | 37 4 | x | + | 37 4 | x | × | 47 4 | x | ) | = | 3000 |
| 方程左边 = | 8321 300 | x | × | 47 4 | x | × | 47 4 | x | + | 8321 300 | x | × | 37 4 | x | × | 37 4 | x |
| = | 18381089 4800 | x | x | x | + | 11391449 4800 | x | x | x | + | 14470219 4800 | x | x | x |
18381089 4800 | x | x | x | + | 11391449 4800 | x | x | x | + | 14470219 4800 | x | x | x | = | 3000 |