( | 150 | + | 537 2 | ) | ÷ | 30 | × | x | + | 164 | ÷ | 30 | × | ( | x | + | 15 | ) | + | 120 | ÷ | 30 | × | ( | x | + | 30 | ) | = | 620 |
方程左边 = | ( | 150 | + | 537 2 | ) | × | 1 30 | x | + | 82 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
( | 150 | + | 537 2 | ) | × | 1 30 | x | + | 82 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) | = | 620 |
方程左边 = | 150 | × | 1 30 | x | + | 537 2 | × | 1 30 | x | + | 82 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
= | 5 | x | + | 179 20 | x | + | 82 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
= | 279 20 | x | + | 82 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
= | 279 20 | x | + | 82 15 | x | + | 82 15 | × | 15 | + | 4 | ( | x | + | 30 | ) |
= | 279 20 | x | + | 82 15 | x | + | 82 | + | 4 | ( | x | + | 30 | ) |
= | 233 12 | x | + | 82 | + | 4 | ( | x | + | 30 | ) |
= | 233 12 | x | + | 82 | + | 4 | x | + | 4 | × | 30 |
= | 233 12 | x | + | 82 | + | 4 | x | + | 120 |
= | 281 12 | x | + | 202 |
281 12 | x | + | 202 | = | 620 |
281 12 | x | = | 620 | − | 202 |
281 12 | x | = | 418 |
x | = | 418 | ÷ | 281 12 |
= | 418 | × | 12 281 |
x | = | 5016 281 |
x | = | 17.850534 |