( | x | + | 10 | ) | + | ( | x | − | 10 | ) | + | ( | x | ÷ | 2 | ) | + | ( | 2 | x | ) | = | 270 |
方程左边 = | x | + | 10 | + | ( | x | − | 10 | ) | + | ( | x | ÷ | 2 | ) | + | ( | 2 | x | ) |
= | x | + | 10 | + | x | − | 10 | + | ( | x | ÷ | 2 | ) | + | ( | 2 | x | ) |
= | 2 | x | + | 0 | + | ( | x | ÷ | 2 | ) | + | ( | 2 | x | ) |
= | 2 | x | + | x | ÷ | 2 | + | ( | 2 | x | ) |
= | 5 2 | x | + | ( | 2 | x | ) |
= | 5 2 | x | + | 2 | x |
= | 9 2 | x |
9 2 | x | = | 270 |
x | = | 270 | ÷ | 9 2 |
= | 270 | × | 2 9 |
= | 30 | × | 2 |
x | = | 60 |