X | = | 4000 | × | 13 10 | × | 6 5 | ( | 1 | − | 1500 | ÷ | 2000 | − | 1500 | + | 693 | ) | + | 100 |
方程右边 = | 6240 | ( | 1 | − | 1500 | ÷ | 2000 | − | 1500 | + | 693 | ) | + | 100 |
X | = | 6240 | ( | 1 | − | 1500 | ÷ | 2000 | − | 1500 | + | 693 | ) | + | 100 |
方程右边 = | 6240 | × | 1 | − | 6240 | × | 1500 | ÷ | 2000 | − | 6240 | × | 1500 | + | 6240 | × | 693 | + | 100 |
= | 6240 | − | 4680 | − | 9360000 | + | 4324320 | + | 100 |
= | - | 5034020 |
X | = | - | 5034020 |