7021959 20 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | = | 68702731 100 |
方程左边 = | 7021959 20 | × | 1 | ( | 1 | + | X | ) | + | 7021959 20 | X | ( | 1 | + | X | ) |
= | 7021959 20 | ( | 1 | + | X | ) | + | 7021959 20 | X | ( | 1 | + | X | ) |
= | 7021959 20 | × | 1 | + | 7021959 20 | X | + | 7021959 20 | X | ( | 1 | + | X | ) |
= | 7021959 20 | + | 7021959 20 | X | + | 7021959 20 | X | ( | 1 | + | X | ) |
= | 7021959 20 | + | 7021959 20 | X | + | 7021959 20 | X | × | 1 | + | 7021959 20 | X | X |
= | 7021959 20 | + | 7021959 20 | X | + | 7021959 20 | X | + | 7021959 20 | X | X |
= | 7021959 20 | + | 7021959 10 | X | + | 7021959 20 | X | X |
7021959 20 | + | 7021959 10 | X | + | 7021959 20 | X | X | = | 68702731 100 |