| ( | x | − | 180 | ) | ( | 1 | − | 25 100 | ) | ÷ | ( | 1000 | + | 500 | ) | = | ( | x | − | 180 | − | 320 | ) | ( | 1 | − | 25 100 | ) | ÷ | 1000 |
| 方程两边同时乘以: | ( | 1000 | + | 500 | ) |
| ( | x | − | 180 | ) | ( | 1 | − | 25 100 | ) | = | ( | x | − | 180 | − | 320 | ) | ( | 1 | − | 25 100 | ) | ÷ | 1000 | × | ( | 1000 | + | 500 | ) |
| x | ( | 1 | − | 25 100 | ) | − | 180 | ( | 1 | − | 25 100 | ) | = | ( | x | − | 180 | − | 320 | ) | ( | 1 | − | 25 100 | ) | ÷ | 1000 | × | ( | 1000 | + | 500 | ) |
| x | ( | 1 | − | 25 100 | ) | − | 180 | ( | 1 | − | 25 100 | ) | = | x | ( | 1 | − | 25 100 | ) | ÷ | 1000 | × | ( | 1000 | + | 500 | ) | − | 180 | ( | 1 | − | 25 100 | ) | ÷ | 1000 | × | ( | 1000 | + | 500 | ) | − | 320 | ( | 1 | − | 25 100 | ) | ÷ | 1000 | × | ( | 1000 | + | 500 | ) |
| x | ( | 1 | − | 25 100 | ) | − | 180 | ( | 1 | − | 25 100 | ) | = | x | ( | 1 | − | 25 100 | ) | × | 1 1000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
| x | × | 1 | − | x | × | 25 100 | − | 180 | ( | 1 | − | 25 100 | ) | = | x | ( | 1 | − | 25 100 | ) | × | 1 1000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
| x | × | 1 | − | x | × | 25 100 | − | 180 | ( | 1 | − | 25 100 | ) | = | x | × | 1 | × | 1 1000 | ( | 1000 | + | 500 | ) | − | x | × | 25 100 | × | 1 1000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 |
| x | × | 1 | − | x | × | 25 100 | − | 180 | ( | 1 | − | 25 100 | ) | = | x | × | 1 1000 | ( | 1000 | + | 500 | ) | − | x | × | 1 4000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 180 | ( | 1 | − | 25 100 | ) | = | x | × | 1 1000 | ( | 1000 | + | 500 | ) | − | x | × | 1 4000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 180 | × | 1 | + | 180 | × | 25 100 | = | x | × | 1 1000 | ( | 1000 | + | 500 | ) | − | x | × | 1 4000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 180 | × | 1 | + | 180 | × | 25 100 | = | x | × | 1 1000 | × | 1000 | + | x | × | 1 1000 | × | 500 | − | x | × | 1 4000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 180 | + | 45 | = | x | × | 1 | + | x | × | 1 2 | − | x | × | 1 4000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) |
3 4 | x | − | 135 | = | 3 2 | x | − | x | × | 1 4000 | ( | 1000 | + | 500 | ) | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 3 2 | x | − | x | × | 1 4000 | × | 1000 | − | x | × | 1 4000 | × | 500 | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 |
3 4 | x | − | 135 | = | 3 2 | x | − | x | × | 1 4 | − | x | × | 1 8 | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 9 50 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 9 50 | × | 1 | ( | 1000 | + | 500 | ) | + | 9 50 | × | 25 100 | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 9 50 | ( | 1000 | + | 500 | ) | + | 9 200 | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 9 50 | × | 1000 | − | 9 50 | × | 500 | + | 9 200 | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 180 | − | 90 | + | 9 200 | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 270 | + | 9 200 | ( | 1000 | + | 500 | ) | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 270 | + | 9 200 | × | 1000 | + | 9 200 | × | 500 | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 270 | + | 45 | + | 45 2 | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 405 2 | − | 8 25 | ( | 1 | − | 25 100 | ) | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 405 2 | − | 8 25 | × | 1 | ( | 1000 | + | 500 | ) | + | 8 25 | × | 25 100 | ( | 1000 | + | 500 | ) |
3 4 | x | − | 135 | = | 9 8 | x | − | 405 2 | − | 8 25 | ( | 1000 | + | 500 | ) | + | 2 25 | ( | 1000 | + | 500 | ) |