( | s | + | 2 | ) | ( | s | + | 4 | ) | ( | s | + | 5 | ) | ( | s | + | 8 | ) | = | 0 |
方程左边 = | s | ( | s | + | 4 | ) | ( | s | + | 5 | ) | ( | s | + | 8 | ) | + | 2 | ( | s | + | 4 | ) | ( | s | + | 5 | ) | ( | s | + | 8 | ) |
= | s | s | ( | s | + | 5 | ) | ( | s | + | 8 | ) | + | s | × | 4 | ( | s | + | 5 | ) | ( | s | + | 8 | ) | + | 2 | ( | s | + | 4 | ) | ( | s | + | 5 | ) | ( | s | + | 8 | ) |
= | s | s | s | ( | s | + | 8 | ) | + | s | s | × | 5 | ( | s | + | 8 | ) | + | s | × | 4 | ( | s | + | 5 | ) | ( | s | + | 8 | ) |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | ( | s | + | 8 | ) |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |
= | s | s | s | s | + | s | s | s | × | 8 | + | s | s | × | 5 | s |