( | x | × | 1 | + | x | × | 2 | ) | ( | x | × | 3 | + | x | × | 4 | ) | ( | x | × | 5 | + | x | × | 6 | ) | = | 0 |
方程左边 = | x | × | 1 | ( | x | × | 3 | + | x | × | 4 | ) | ( | x | × | 5 | + | x | × | 6 | ) | + | x | × | 2 | ( | x | × | 3 | + | x | × | 4 | ) | ( | x | × | 5 | + | x | × | 6 | ) |
= | x | × | 1 | x | × | 3 | ( | x | × | 5 | + | x | × | 6 | ) | + | x | × | 1 | x | × | 4 | ( | x | × | 5 | + | x | × | 6 | ) | + | x | × | 2 |
= | x | × | 3 | x | ( | x | × | 5 | + | x | × | 6 | ) | + | x | × | 4 | x | ( | x | × | 5 | + | x | × | 6 | ) | + | x | × | 2 | ( | x | × | 3 | + | x | × | 4 | ) | ( | x | × | 5 | + | x | × | 6 | ) |
= | x | × | 3 | x | x | × | 5 | + | x | × | 3 | x | x | × | 6 | + | x | × | 4 |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 4 | x | ( | x | × | 5 | + | x | × | 6 | ) |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 4 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
= | x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x |
x | × | 15 | x | x | + | x | × | 18 | x | x | + | x | × | 20 | x | x | = | 0 |