( | 300 | + | 5 | ( | x | − | 200 | ) | ) | ( | x | − | 100 | ) | = | 32000 |
方程左边 = | 300 | ( | x | − | 100 | ) | + | 5 | ( | x | − | 200 | ) | ( | x | − | 100 | ) |
= | 300 | x | − | 300 | × | 100 | + | 5 | ( | x | − | 200 | ) | ( | x | − | 100 | ) |
= | 300 | x | − | 30000 | + | 5 | ( | x | − | 200 | ) | ( | x | − | 100 | ) |
= | 300 | x | − | 30000 | + | 5 | x | ( | x | − | 100 | ) | − | 5 | × | 200 | ( | x | − | 100 | ) |
= | 300 | x | − | 30000 | + | 5 | x | ( | x | − | 100 | ) | − | 1000 | ( | x | − | 100 | ) |
= | 300 | x | − | 30000 | + | 5 | x | x | − | 5 | x | × | 100 | − | 1000 | ( | x | − | 100 | ) |
= | 300 | x | − | 30000 | + | 5 | x | x | − | 500 | x | − | 1000 | ( | x | − | 100 | ) |
= | - | 200 | x | − | 30000 | + | 5 | x | x | − | 1000 | ( | x | − | 100 | ) |
= | - | 200 | x | − | 30000 | + | 5 | x | x | − | 1000 | x | + | 1000 | × | 100 |
= | - | 200 | x | − | 30000 | + | 5 | x | x | − | 1000 | x | + | 100000 |
= | - | 1200 | x | + | 70000 | + | 5 | x | x |
- | 1200 | x | + | 70000 | + | 5 | x | x | = | 32000 |