x | ( | 10 | − | 1 5 | x | ) | + | ( | 50 | − | x | ) | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) | = | 100 |
方程左边 = | x | × | 10 | − | x | × | 1 5 | x | + | ( | 50 | − | x | ) | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 50 | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) | − | x | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 50 | × | 10 | ( | 1 2 | ) | − | 50 | × | 1 5 | x | ( | 1 2 | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 500 | ( | 1 2 | ) | − | 10 | x | ( | 1 2 | ) | − | x | ( | 10 | − | 1 5 | x | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 500 | × | 1 2 | − | 10 | x | ( | 1 2 | ) | − | x | ( | 10 | − | 1 5 | x | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 250 | − | 10 | x | ( | 1 2 | ) | − | x | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 250 | − | 10 | x | × | 1 2 | − | x | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) |
= | 10 | x | − | x | × | 1 5 | x | + | 250 | − | 5 | x | − | x | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) |
= | 5 | x | − | x | × | 1 5 | x | + | 250 | − | x | ( | 10 | − | 1 5 | x | ) | ( | 1 2 | ) |
= | 5 | x | − | x | × | 1 5 | x | + | 250 | − | x | × | 10 | ( | 1 2 | ) | + | x | × | 1 5 | x |
= | 5 | x | − | x | × | 1 5 | x | + | 250 | − | x | × | 10 | × | 1 2 | + | x | × | 1 5 | x |
= | 5 | x | − | x | × | 1 5 | x | + | 250 | − | x | × | 5 | + | x | × | 1 5 | x | ( | 1 2 | ) |
= | 0 | x | − | x | × | 1 5 | x | + | 250 | + | x | × | 1 5 | x | ( | 1 2 | ) |
= | - | x | × | 1 5 | x | + | 250 | + | x | × | 1 5 | x | × | 1 2 |
= | - | x | × | 1 5 | x | + | 250 | + | x | × | 1 10 | x |
- | x | × | 1 5 | x | + | 250 | + | x | × | 1 10 | x | = | 100 |