X | = | 4000 | × | 5 4 | ( | 1 | + | 3 10 | ) | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
方程右边 = | 5000 | ( | 1 | + | 3 10 | ) | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
X | = | 5000 | ( | 1 | + | 3 10 | ) | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
方程右边 = | 5000 | × | 1 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 5000 | × | 3 10 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
= | 5000 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
= | 5000 | × | 1 | ( | 1 | − | 2 5 | ) | + | 5000 | × | 1 5 | ( | 1 | − | 2 5 | ) | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
= | 5000 | ( | 1 | − | 2 5 | ) | + | 1000 | ( | 1 | − | 2 5 | ) | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
= | 5000 | × | 1 | − | 5000 | × | 2 5 | + | 1000 | ( | 1 | − | 2 5 | ) | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
= | 5000 | − | 2000 | + | 1000 | ( | 1 | − | 2 5 | ) | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) | + | 100 |
= | 3100 | + | 1000 | ( | 1 | − | 2 5 | ) | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) |
= | 3100 | + | 1000 | × | 1 | − | 1000 | × | 2 5 | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) |
= | 3100 | + | 1000 | − | 400 | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) |
= | 3700 | + | 1500 | ( | 1 | + | 1 5 | ) | ( | 1 | − | 2 5 | ) |
= | 3700 | + | 1500 | × | 1 | ( | 1 | − | 2 5 | ) | + | 1500 | × | 1 5 | ( | 1 | − | 2 5 | ) |
= | 3700 | + | 1500 | ( | 1 | − | 2 5 | ) | + | 300 | ( | 1 | − | 2 5 | ) |
= | 3700 | + | 1500 | × | 1 | − | 1500 | × | 2 5 | + | 300 | ( | 1 | − | 2 5 | ) |
= | 3700 | + | 1500 | − | 600 | + | 300 | ( | 1 | − | 2 5 | ) |
= | 4600 | + | 300 | ( | 1 | − | 2 5 | ) |
= | 4600 | + | 300 | × | 1 | − | 300 | × | 2 5 |
= | 4600 | + | 300 | − | 120 |
= | 4780 |
X | = | 4780 |