| x | = | 4 | × | 5 | + | ( | 99999 | × | 9999999999999 | ) | + | ( | 9999999999999 | × | 9999999999999 | ) |
| 方程右边 = | 20 | + | ( | 99999 | × | 9999999999999 | ) | + | ( | 9999999999999 | × | 9999999999999 | ) |
| x | = | 20 | + | ( | 99999 | × | 9999999999999 | ) | + | ( | 9999999999999 | × | 9999999999999 | ) |
| 方程右边 = | 20 | + | 99999 | × | 9999999999999 | + | ( | 9999999999999 | × | 9999999999999 | ) |