( | X | − | 1100 | × | 7200 | ) | ÷ | X | = | 1969 5000 |
方程两边同时乘以: | X |
( | X | − | 1100 | × | 7200 | ) | = | 1969 5000 | X |
X | − | 1100 | × | 7200 | = | 1969 5000 | X |
X | − | 7920000 | = | 1969 5000 | X |
X | − | 1969 5000 | X | = | 7920000 |
3031 5000 | X | = | 7920000 |
X | = | 7920000 | ÷ | 3031 5000 |
= | 7920000 | × | 5000 3031 |
X | = | 39600000000 3031 |