| x | − | 1 | ÷ | ( | 1000000000000 | × | 15707963 5000000 | × | 15707963 5000000 | ) | = | 0 |
| 方程两边同时乘以: | ( | 1000000000000 | × | 15707963 5000000 | × | 15707963 5000000 | ) |
| x | ( | 1000000000000 | × | 15707963 5000000 | × | 15707963 5000000 | ) | − | 1 | = | 0 |
| x | × | 1000000000000 | × | 15707963 5000000 | × | 15707963 5000000 | − | 1 | = | 0 |