( | ( | 23 | − | X | ) | × | 80 | ( | 1 | − | 5 100 | ) | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) | = | 2400 |
方程左边 = | ( | 23 | − | X | ) | × | 80 | ( | 1 | − | 5 100 | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 23 | × | 80 | ( | 1 | − | 5 100 | ) | − | X | × | 80 | ( | 1 | − | 5 100 | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1840 | ( | 1 | − | 5 100 | ) | − | X | × | 80 | ( | 1 | − | 5 100 | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1840 | × | 1 | − | 1840 | × | 5 100 | − | X | × | 80 | ( | 1 | − | 5 100 | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1840 | − | 92 | − | X | × | 80 | ( | 1 | − | 5 100 | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1748 | − | X | × | 80 | ( | 1 | − | 5 100 | ) | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1748 | − | X | × | 80 | × | 1 | + | X | × | 80 | × | 5 100 | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1748 | − | X | × | 80 | + | X | × | 4 | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1748 | − | 76 | X | + | ( | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) | ) |
= | 1748 | − | 76 | X | + | X | ( | 80 | ( | 1 | − | 15 100 | ) | ) |
= | 1748 | − | 76 | X | + | X | × | 80 | ( | 1 | − | 15 100 | ) |
= | 1748 | − | 76 | X | + | X | × | 80 | × | 1 | − | X | × | 80 | × | 15 100 |
= | 1748 | − | 76 | X | + | X | × | 80 | − | X | × | 12 |
= | 1748 | − | 8 | X |
1748 | − | 8 | X | = | 2400 |
- | 8 | X | = | 2400 | − | 1748 |
- | 8 | X | = | 652 |
- | 652 | = | 8 | X |
8 | X | = | - | 652 |
X | = | - | 652 | ÷ | 8 |
= | - | 652 | × | 1 8 |
= | - | 163 | × | 1 2 |
X | = | - | 163 2 |
X | = | - 81.5 |