( | 14 | − | x | − | 8 | ) | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) | = | 1560 |
方程左边 = | 14 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) | − | x | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) | − | 8 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) |
= | 14 | × | 400 | + | 14 | x | ÷ | 1 2 | × | 20 | − | x | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) | − | 8 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) |
= | 5600 | + | 560 | x | − | x | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) | − | 8 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) |
= | 5600 | + | 560 | x | − | x | × | 400 | − | x | x | ÷ | 1 2 | × | 20 | − | 8 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) |
= | 5600 | + | 560 | x | − | x | × | 400 | − | x | x | × | 40 | − | 8 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) |
= | 5600 | + | 160 | x | − | x | x | × | 40 | − | 8 | ( | 400 | + | x | ÷ | 1 2 | × | 20 | ) |
= | 5600 | + | 160 | x | − | x | x | × | 40 | − | 8 | × | 400 | − | 8 | x | ÷ | 1 2 | × | 20 |
= | 5600 | + | 160 | x | − | x | x | × | 40 | − | 3200 | − | 320 | x |
= | 2400 | − | 160 | x | − | x | x | × | 40 |
2400 | − | 160 | x | − | x | x | × | 40 | = | 1560 |