( | X | - | 180 | ) | ( | 1 | - | 3 4 | ) | ÷ | 2400 | = | ( | X | - | 450 | ) | ( | 1 | - | 3 4 | ) | ÷ | 2000 |
方程左边 = | X | ( | 1 | - | 3 4 | ) | × | 1 2400 | - | 180 | ( | 1 | - | 3 4 | ) | × | 1 2400 |
= | X | ( | 1 | - | 3 4 | ) | × | 1 2400 | - | 3 40 | ( | 1 | - | 3 4 | ) |
= | X | × | 1 | × | 1 2400 | - | X | × | 3 4 | × | 1 2400 | - | 3 40 | ( | 1 | - | 3 4 | ) |
= | X | × | 1 2400 | - | X | × | 1 3200 | - | 3 40 | ( | 1 | - | 3 4 | ) |
= | 1 9600 | X | - | 3 40 | ( | 1 | - | 3 4 | ) |
= | 1 9600 | X | - | 3 40 | × | 1 | + | 3 40 | × | 3 4 |
= | 1 9600 | X | - | 3 40 | + | 9 160 |
= | 1 9600 | X | - | 3 160 |
1 9600 | X | - | 3 160 | = | ( | X | - | 450 | ) | ( | 1 | - | 3 4 | ) | ÷ | 2000 |
方程右边 = | X | ( | 1 | - | 3 4 | ) | × | 1 2000 | - | 450 | ( | 1 | - | 3 4 | ) | × | 1 2000 |
= | X | ( | 1 | - | 3 4 | ) | × | 1 2000 | - | 9 40 | ( | 1 | - | 3 4 | ) |
= | X | × | 1 | × | 1 2000 | - | X | × | 3 4 | × | 1 2000 | - | 9 40 | ( | 1 | - | 3 4 | ) |
= | X | × | 1 2000 | - | X | × | 3 8000 | - | 9 40 | ( | 1 | - | 3 4 | ) |
= | 1 8000 | X | - | 9 40 | ( | 1 | - | 3 4 | ) |
= | 1 8000 | X | - | 9 40 | × | 1 | + | 9 40 | × | 3 4 |
= | 1 8000 | X | - | 9 40 | + | 27 160 |
= | 1 8000 | X | - | 9 160 |
1 9600 | X | - | 3 160 | = | 1 8000 | X | - | 9 160 |
1 9600 | X | - | 1 8000 | X | = | - | 9 160 | + | 3 160 |
- | 1 48000 | X | = | - | 9 160 | + | 3 160 |
- | 1 48000 | X | = | - | 3 80 |
1 48000 | X | = | 3 80 |
X | = | 3 80 | ÷ | 1 48000 |
= | 3 80 | × | 48000 |
= | 3 | × | 600 |
X | = | 1800 |