( | 1200 | + | 200 | x | − | 1600 | x | − | 64000 | ) | ( | 80 | − | 2 | x | ) | = | 122000 |
方程左边 = | 1200 | ( | 80 | − | 2 | x | ) | + | 200 | x | ( | 80 | − | 2 | x | ) | − | 1600 | x | ( | 80 | − | 2 | x | ) | − | 64000 | ( | 80 | − | 2 | x | ) |
= | 1200 | × | 80 | − | 1200 | × | 2 | x | + | 200 | x | ( | 80 | − | 2 | x | ) | − | 1600 | x | ( | 80 | − | 2 | x | ) | − | 64000 |
= | 96000 | − | 2400 | x | + | 200 | x | ( | 80 | − | 2 | x | ) | − | 1600 | x | ( | 80 | − | 2 | x | ) | − | 64000 | ( | 80 | − | 2 | x | ) |
= | 96000 | − | 2400 | x | + | 200 | x | × | 80 | − | 200 | x | × | 2 | x | − | 1600 | x |
= | 96000 | − | 2400 | x | + | 16000 | x | − | 400 | x | x | − | 1600 | x | ( | 80 | − | 2 | x | ) | − | 64000 |
= | 96000 | + | 13600 | x | − | 400 | x | x | − | 1600 | x | ( | 80 | − | 2 | x | ) | − | 64000 | ( | 80 | − | 2 | x | ) |
= | 96000 | + | 13600 | x | − | 400 | x | x | − | 1600 | x | × | 80 | + | 1600 | x | × | 2 |
= | 96000 | + | 13600 | x | − | 400 | x | x | − | 128000 | x | + | 3200 | x | x | − | 64000 |
= | 96000 | − | 114400 | x | − | 400 | x | x | + | 3200 | x | x | − | 64000 | ( | 80 | − | 2 | x | ) |
= | 96000 | − | 114400 | x | − | 400 | x | x | + | 3200 | x | x | − | 64000 | × | 80 | + | 64000 |
= | 96000 | − | 114400 | x | − | 400 | x | x | + | 3200 | x | x | − | 5120000 | + | 128000 | x |
= | - | 5024000 | + | 13600 | x | − | 400 | x | x | + | 3200 | x | x |
- | 5024000 | + | 13600 | x | − | 400 | x | x | + | 3200 | x | x | = | 122000 |