( | 16 | − | 3 | X | ) | ( | 160 | + | 3 | X | ) | = | 3640 |
方程左边 = | 16 | ( | 160 | + | 3 | X | ) | − | 3 | X | ( | 160 | + | 3 | X | ) |
= | 16 | × | 160 | + | 16 | × | 3 | X | − | 3 | X | ( | 160 | + | 3 | X | ) |
= | 2560 | + | 48 | X | − | 3 | X | ( | 160 | + | 3 | X | ) |
= | 2560 | + | 48 | X | − | 3 | X | × | 160 | − | 3 | X | × | 3 | X |
= | 2560 | + | 48 | X | − | 480 | X | − | 9 | X | X |
= | 2560 | − | 432 | X | − | 9 | X | X |
2560 | − | 432 | X | − | 9 | X | X | = | 3640 |