10 100 | = | ( | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | ) | ÷ | ( | 1 | − | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | ) |
| 方程两边同时乘以: | ( | 1 | − | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | ) |
10 100 | ( | 1 | − | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | ) | = | ( | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | ) |
10 100 | × | 1 | − | 10 100 | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | = | ( | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | ) |
10 100 | × | 1 | − | 10 100 | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X | = | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X |
1 10 | − | 1 125 | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | X | = | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X |
1 10 | − | 1 125 | × | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | × | X | = | ( | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | ) | × | 8 100 | X |
1 10 | − | 1 125 | × | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | × | X | = | 1 | ÷ | ( | 70 100 | − | 15 100 | ) | × | 8 100 | X |
1 10 | − | 1 125 | ÷ | ( | 70 100 | − | 15 100 | ) | × | X | = | 2 25 | ÷ | ( | 70 100 | − | 15 100 | ) | × | X |
| 方程两边同时乘以: | ( | 70 100 | − | 15 100 | ) | , | ( | 70 100 | − | 15 100 | ) |
1 10 | ( | 70 100 | − | 15 100 | ) | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 2 25 | X | ( | 70 100 | − | 15 100 | ) |
1 10 | × | 70 100 | ( | 70 100 | − | 15 100 | ) | − | 1 10 | × | 15 100 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 2 25 | X | ( | 70 100 | − | 15 100 | ) |
1 10 | × | 70 100 | ( | 70 100 | − | 15 100 | ) | − | 1 10 | × | 15 100 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 2 25 | X | × | 70 100 | − | 2 25 | X | × | 15 100 |
7 100 | ( | 70 100 | − | 15 100 | ) | − | 3 200 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 7 125 | X | − | 3 250 | X |
7 100 | ( | 70 100 | − | 15 100 | ) | − | 3 200 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
7 100 | × | 70 100 | − | 7 100 | × | 15 100 | − | 3 200 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
49 1000 | − | 21 2000 | − | 3 200 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
77 2000 | − | 3 200 | ( | 70 100 | − | 15 100 | ) | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
77 2000 | − | 3 200 | × | 70 100 | + | 3 200 | × | 15 100 | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
77 2000 | − | 21 2000 | + | 9 4000 | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
121 4000 | − | 1 125 | X | ( | 70 100 | − | 15 100 | ) | = | 11 250 | X |
121 4000 | − | 1 125 | X | × | 70 100 | + | 1 125 | X | × | 15 100 | = | 11 250 | X |
121 4000 | − | 7 1250 | X | + | 3 2500 | X | = | 11 250 | X |
121 4000 | − | 11 2500 | X | = | 11 250 | X |
| - | 11 2500 | X | − | 11 250 | X | = | - | 121 4000 |
| - | 121 2500 | X | = | - | 121 4000 |
121 4000 | = | 121 2500 | X |
121 2500 | X | = | 121 4000 |
| X | = | 121 4000 | ÷ | 121 2500 |
| = | 121 4000 | × | 2500 121 |
| = | 1 8 | × | 5 |
| X | = | 5 8 |
| X | = | 0.625 |