x | + | 30 | ÷ | ( | 1 | + | 20 100 | ) | − | x | ÷ | ( | 1 | + | 30 100 | ) | = | 4 |
方程两边同时乘以: | ( | 1 | + | 20 100 | ) |
x | ( | 1 | + | 20 100 | ) | + | 30 | − | x | ÷ | ( | 1 | + | 30 100 | ) | × | ( | 1 | + | 20 100 | ) | = | 4 | ( | 1 | + | 20 100 | ) |
x | × | 1 | + | x | × | 20 100 | + | 30 | − | x | ÷ | ( | 1 | + | 30 100 | ) | × | ( | 1 | + | 20 100 | ) | = | 4 | ( | 1 | + | 20 100 | ) |
x | × | 1 | + | x | × | 20 100 | + | 30 | − | x | ÷ | ( | 1 | + | 30 100 | ) | × | ( | 1 | + | 20 100 | ) | = | 4 | × | 1 | + | 4 | × | 20 100 |
x | × | 1 | + | x | × | 20 100 | + | 30 | − | x | ÷ | ( | 1 | + | 30 100 | ) | × | ( | 1 | + | 20 100 | ) | = | 4 | + | 4 5 |
6 5 | x | + | 30 | − | x | ÷ | ( | 1 | + | 30 100 | ) | × | ( | 1 | + | 20 100 | ) | = | 24 5 |
方程两边同时乘以: | ( | 1 | + | 30 100 | ) |
6 5 | x | ( | 1 | + | 30 100 | ) | + | 30 | ( | 1 | + | 30 100 | ) | − | x | ( | 1 | + | 20 100 | ) | = | 24 5 | ( | 1 | + | 30 100 | ) |
6 5 | x | × | 1 | + | 6 5 | x | × | 30 100 | + | 30 | ( | 1 | + | 30 100 | ) | − | x | ( | 1 | + | 20 100 | ) | = | 24 5 | ( | 1 | + | 30 100 | ) |
6 5 | x | × | 1 | + | 6 5 | x | × | 30 100 | + | 30 | ( | 1 | + | 30 100 | ) | − | x | ( | 1 | + | 20 100 | ) | = | 24 5 | × | 1 | + | 24 5 | × | 30 100 |
6 5 | x | + | 9 25 | x | + | 30 | ( | 1 | + | 30 100 | ) | − | x | ( | 1 | + | 20 100 | ) | = | 24 5 | + | 36 25 |
39 25 | x | + | 30 | ( | 1 | + | 30 100 | ) | − | x | ( | 1 | + | 20 100 | ) | = | 156 25 |
39 25 | x | + | 30 | × | 1 | + | 30 | × | 30 100 | − | x | ( | 1 | + | 20 100 | ) | = | 156 25 |
39 25 | x | + | 30 | + | 9 | − | x | ( | 1 | + | 20 100 | ) | = | 156 25 |
39 25 | x | + | 39 | − | x | ( | 1 | + | 20 100 | ) | = | 156 25 |
39 25 | x | + | 39 | − | x | × | 1 | − | x | × | 20 100 | = | 156 25 |
9 25 | x | + | 39 | = | 156 25 |
9 25 | x | = | 156 25 | − | 39 |
9 25 | x | = | - | 819 25 |
x | = | - | 819 25 | ÷ | 9 25 |
= | - | 819 25 | × | 25 9 |
= | - | 91 | × | 1 |
x | = | - | 91 |