( | x | − | 250 | ) | ( | 8 | + | 290 | − | x | ÷ | 5 | × | x | × | 4 | ) | = | 480 |
方程左边 = | x | ( | 8 | + | 290 | − | x | ÷ | 5 | × | x | × | 4 | ) | − | 250 | ( | 8 | + | 290 | − | x | ÷ | 5 | × | x | × | 4 | ) |
= | x | × | 8 | + | x | × | 290 | − | x | x | ÷ | 5 | × | x | × | 4 | − | 250 | ( | 8 | + | 290 | − | x | ÷ | 5 | × | x | × | 4 | ) |
= | x | × | 8 | + | x | × | 290 | − | x | x | × | 4 5 | x | − | 250 | ( | 8 | + | 290 | − | x | ÷ | 5 | × | x | × | 4 | ) |
= | 298 | x | − | x | x | × | 4 5 | x | − | 250 | ( | 8 | + | 290 | − | x | ÷ | 5 | × | x | × | 4 | ) |
= | 298 | x | − | x | x | × | 4 5 | x | − | 250 | × | 8 | − | 250 | × | 290 | + | 250 | x |
= | 298 | x | − | x | x | × | 4 5 | x | − | 2000 | − | 72500 | + | 200 | x | x |
= | 298 | x | − | x | x | × | 4 5 | x | − | 74500 | + | 200 | x | x |
298 | x | − | x | x | × | 4 5 | x | − | 74500 | + | 200 | x | x | = | 480 |