( | x | − | 60 | ) | ( | 1 | − | 20 100 | ) | ÷ | 800 | = | 0 |
方程左边 = | x | ( | 1 | − | 20 100 | ) | × | 1 800 | − | 60 | ( | 1 | − | 20 100 | ) | × | 1 800 |
= | x | ( | 1 | − | 20 100 | ) | × | 1 800 | − | 3 40 | ( | 1 | − | 20 100 | ) |
= | x | × | 1 | × | 1 800 | − | x | × | 20 100 | × | 1 800 | − | 3 40 | ( | 1 | − | 20 100 | ) |
= | x | × | 1 800 | − | x | × | 1 4000 | − | 3 40 | ( | 1 | − | 20 100 | ) |
= | 1 1000 | x | − | 3 40 | ( | 1 | − | 20 100 | ) |
= | 1 1000 | x | − | 3 40 | × | 1 | + | 3 40 | × | 20 100 |
= | 1 1000 | x | − | 3 40 | + | 3 200 |
= | 1 1000 | x | − | 3 50 |
1 1000 | x | − | 3 50 | = | 0 |
1 1000 | x | = | 0 | + | 3 50 |
1 1000 | x | = | 3 50 |
x | = | 3 50 | ÷ | 1 1000 |
= | 3 50 | × | 1000 |
= | 3 | × | 20 |
x | = | 60 |