( | 55 | − | 35 | − | x | ) | ( | 10 | x | + | 100 | ) | = | 1760 |
方程左边 = | 55 | ( | 10 | x | + | 100 | ) | − | 35 | ( | 10 | x | + | 100 | ) | − | x | ( | 10 | x | + | 100 | ) |
= | 55 | × | 10 | x | + | 55 | × | 100 | − | 35 | ( | 10 | x | + | 100 | ) | − | x | ( | 10 | x | + | 100 | ) |
= | 550 | x | + | 5500 | − | 35 | ( | 10 | x | + | 100 | ) | − | x | ( | 10 | x | + | 100 | ) |
= | 550 | x | + | 5500 | − | 35 | × | 10 | x | − | 35 | × | 100 | − | x | ( | 10 | x | + | 100 | ) |
= | 550 | x | + | 5500 | − | 350 | x | − | 3500 | − | x | ( | 10 | x | + | 100 | ) |
= | 200 | x | + | 2000 | − | x | ( | 10 | x | + | 100 | ) |
= | 200 | x | + | 2000 | − | x | × | 10 | x | − | x | × | 100 |
= | 100 | x | + | 2000 | − | x | × | 10 | x |
100 | x | + | 2000 | − | x | × | 10 | x | = | 1760 |