180 | × | 11 20 | + | 3 5 | ( | x | − | 180 | ) | + | 180 | × | 11 20 | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) | = | 487 |
方程左边 = | 99 | + | 3 5 | ( | x | − | 180 | ) | + | 99 | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 198 | + | 3 5 | ( | x | − | 180 | ) | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
198 | + | 3 5 | ( | x | − | 180 | ) | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) | = | 487 |
方程左边 = | 198 | + | 3 5 | x | − | 3 5 | × | 180 | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 198 | + | 3 5 | x | − | 108 | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 90 | + | 3 5 | x | + | 3 5 | ( | 400 | − | 180 | ) | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 90 | + | 3 5 | x | + | 3 5 | × | 400 | − | 3 5 | × | 180 | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 90 | + | 3 5 | x | + | 240 | − | 108 | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 222 | + | 3 5 | x | + | 17 20 | ( | 800 | − | x | − | 400 | ) |
= | 222 | + | 3 5 | x | + | 17 20 | × | 800 | − | 17 20 | x | − | 17 20 | × | 400 |
= | 222 | + | 3 5 | x | + | 680 | − | 17 20 | x | − | 340 |
= | 562 | − | 1 4 | x |
562 | − | 1 4 | x | = | 487 |
- | 1 4 | x | = | 487 | − | 562 |
- | 1 4 | x | = | - | 75 |
75 | = | 1 4 | x |
1 4 | x | = | 75 |
x | = | 75 | ÷ | 1 4 |
= | 75 | × | 4 |
x | = | 300 |