x | ( | 1 | − | 2 | ÷ | 3 | ) | + | ( | 61 | − | x | ) | ( | 1 | − | 3 | ÷ | 4 | ) | = | 20 |
方程左边 = | x | × | 1 | − | x | × | 2 | ÷ | 3 | + | ( | 61 | − | x | ) | ( | 1 | − | 3 | ÷ | 4 | ) |
= | x | × | 1 | − | x | × | 2 3 | + | ( | 61 | − | x | ) | ( | 1 | − | 3 | ÷ | 4 | ) |
= | 1 3 | x | + | ( | 61 | − | x | ) | ( | 1 | − | 3 | ÷ | 4 | ) |
= | 1 3 | x | + | 61 | ( | 1 | − | 3 | ÷ | 4 | ) | − | x | ( | 1 | − | 3 | ÷ | 4 | ) |
= | 1 3 | x | + | 61 | × | 1 | − | 61 | × | 3 | ÷ | 4 | − | x | ( | 1 | − | 3 | ÷ | 4 | ) |
= | 1 3 | x | + | 61 | − | 183 4 | − | x | ( | 1 | − | 3 | ÷ | 4 | ) |
= | 1 3 | x | + | 61 4 | − | x | ( | 1 | − | 3 | ÷ | 4 | ) |
= | 1 3 | x | + | 61 4 | − | x | × | 1 | + | x | × | 3 | ÷ | 4 |
= | 1 3 | x | + | 61 4 | − | x | × | 1 | + | x | × | 3 4 |
= | 1 12 | x | + | 61 4 |
1 12 | x | + | 61 4 | = | 20 |
1 12 | x | = | 20 | − | 61 4 |
1 12 | x | = | 19 4 |
x | = | 19 4 | ÷ | 1 12 |
= | 19 4 | × | 12 |
= | 19 | × | 3 |
x | = | 57 |