27 10 | − | 36 5 | ÷ | 3 | × | c | ( | 90 | + | 113 10 | ) | = | 0 |
| 方程左边 = | 27 10 | − | 12 5 | c | ( | 90 | + | 113 10 | ) |
27 10 | − | 12 5 | c | ( | 90 | + | 113 10 | ) | = | 0 |
| 方程左边 = | 27 10 | − | 12 5 | c | × | 90 | − | 12 5 | c | × | 113 10 |
| = | 27 10 | − | 216 | c | − | 678 25 | c |
| = | 27 10 | − | 6078 25 | c |
27 10 | − | 6078 25 | c | = | 0 |
| - | 6078 25 | c | = | 0 | − | 27 10 |
| - | 6078 25 | c | = | - | 27 10 |
27 10 | = | 6078 25 | c |
6078 25 | c | = | 27 10 |
| c | = | 27 10 | ÷ | 6078 25 |
| = | 27 10 | × | 25 6078 |
| = | 9 2 | × | 5 2026 |
| c | = | 45 4052 |
| c | = | 0.011106 |