( | 186 | + | 186 | ) | ÷ | 31 | × | x | + | 279 | ÷ | 31 | × | ( | x | + | 15 | ) | + | 124 | ÷ | 31 | × | ( | x | + | 30 | ) | = | 1544 |
方程左边 = | ( | 186 | + | 186 | ) | × | 1 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
( | 186 | + | 186 | ) | × | 1 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) | = | 1544 |
方程左边 = | 186 | × | 1 31 | x | + | 186 | × | 1 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
= | 6 | x | + | 6 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
= | 12 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
= | 12 | x | + | 9 | x | + | 9 | × | 15 | + | 4 | ( | x | + | 30 | ) |
= | 12 | x | + | 9 | x | + | 135 | + | 4 | ( | x | + | 30 | ) |
= | 21 | x | + | 135 | + | 4 | ( | x | + | 30 | ) |
= | 21 | x | + | 135 | + | 4 | x | + | 4 | × | 30 |
= | 21 | x | + | 135 | + | 4 | x | + | 120 |
= | 25 | x | + | 255 |
25 | x | + | 255 | = | 1544 |
25 | x | = | 1544 | − | 255 |
25 | x | = | 1289 |
x | = | 1289 | ÷ | 25 |
= | 1289 | × | 1 25 |
x | = | 1289 25 |
x | = | 51.56 |