( | x | + | 1 | ) | ( | x | + | 3 | ) | ( | x | + | 5 | ) | = | 480 |
方程左边 = | x | ( | x | + | 3 | ) | ( | x | + | 5 | ) | + | 1 | ( | x | + | 3 | ) | ( | x | + | 5 | ) |
= | x | x | ( | x | + | 5 | ) | + | x | × | 3 | ( | x | + | 5 | ) | + | 1 | ( | x | + | 3 | ) | ( | x | + | 5 | ) |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | ( | x | + | 5 | ) | + | 1 | ( | x | + | 3 | ) | ( | x | + | 5 | ) |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | x | × | 3 | × | 5 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | x | × | 15 | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 20 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 20 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 20 | x | + | 1 |
= | x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 23 | x | + | 1 |
x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 23 | x | + | 1 | = | 480 |