( | x | + | 20 | ) | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) | = | ( | 20 | − | x | ) | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
方程左边 = | x | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) | + | 20 | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) |
= | x | × | 7 2000 | + | x | ( | 20 | − | x | ) | ÷ | 18 | + | 20 | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) |
= | 7 2000 | x | + | x | × | 20 | × | 1 18 | − | x | x | × | 1 18 | + | 20 | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) |
= | 7 2000 | x | + | x | × | 10 9 | − | x | x | × | 1 18 | + | 20 | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) |
= | 20063 18000 | x | − | x | x | × | 1 18 | + | 20 | ( | 7 2000 | + | ( | 20 | − | x | ) | ÷ | 18 | ) |
= | 20063 18000 | x | − | x | x | × | 1 18 | + | 20 | × | 7 2000 | + | 20 | ( | 20 | − | x | ) | ÷ | 18 |
= | 20063 18000 | x | − | x | x | × | 1 18 | + | 7 100 | + | 10 9 | ( | 20 | − | x | ) |
= | 20063 18000 | x | − | x | x | × | 1 18 | + | 7 100 | + | 10 9 | × | 20 | − | 10 9 | x |
= | 20063 18000 | x | − | x | x | × | 1 18 | + | 7 100 | + | 200 9 | − | 10 9 | x |
= | 7 2000 | x | − | x | x | × | 1 18 | + | 20063 900 |
7 2000 | x | − | x | x | × | 1 18 | + | 20063 900 | = | ( | 20 | − | x | ) | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
方程右边 = | 20 | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) | − | x | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
= | 20 | × | 49 10000 | + | 20 | ( | 20 | + | x | ) | ÷ | 18 | − | x | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
= | 49 500 | + | 10 9 | ( | 20 | + | x | ) | − | x | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
= | 49 500 | + | 10 9 | × | 20 | + | 10 9 | x | − | x | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
= | 49 500 | + | 200 9 | + | 10 9 | x | − | x | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
= | 100441 4500 | + | 10 9 | x | − | x | ( | 49 10000 | + | ( | 20 | + | x | ) | ÷ | 18 | ) |
= | 100441 4500 | + | 10 9 | x | − | x | × | 49 10000 | − | x | ( | 20 | + | x | ) | ÷ | 18 |
= | 100441 4500 | + | 99559 90000 | x | − | x | ( | 20 | + | x | ) | × | 1 18 |
= | 100441 4500 | + | 99559 90000 | x | − | x | × | 20 | × | 1 18 | − | x | x | × | 1 18 |
= | 100441 4500 | + | 99559 90000 | x | − | x | × | 10 9 | − | x | x | × | 1 18 |
= | 100441 4500 | − | 49 10000 | x | − | x | x | × | 1 18 |
7 2000 | x | − | x | x | × | 1 18 | + | 20063 900 | = | 100441 4500 | − | 49 10000 | x | − | x | x | × | 1 18 |
x= | 10 3 |