( | 84 | − | x | − | x | ) | ( | 56 | − | x | ) | × | 100 | = | 432000 |
方程左边 = | 84 | ( | 56 | − | x | ) | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 8400 | ( | 56 | − | x | ) | − | x | ( | 56 | − | x | ) | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 8400 | × | 56 | − | 8400 | x | − | x | ( | 56 | − | x | ) | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 470400 | − | 8400 | x | − | x | ( | 56 | − | x | ) | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 470400 | − | 8400 | x | − | x | × | 56 | × | 100 | + | x | x | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 470400 | − | 8400 | x | − | x | × | 5600 | + | x | x | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 470400 | − | 14000 | x | + | x | x | × | 100 | − | x | ( | 56 | − | x | ) | × | 100 |
= | 470400 | − | 14000 | x | + | x | x | × | 100 | − | x | × | 56 | × | 100 | + | x | x | × | 100 |
= | 470400 | − | 14000 | x | + | x | x | × | 100 | − | x | × | 5600 | + | x | x | × | 100 |
= | 470400 | − | 19600 | x | + | x | x | × | 100 | + | x | x | × | 100 |
470400 | − | 19600 | x | + | x | x | × | 100 | + | x | x | × | 100 | = | 432000 |