143 100 | ( | x | − | 220 | ) | ÷ | 2 | × | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) | = | 81700000 |
| 方程左边 = | 143 200 | ( | x | − | 220 | ) | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) |
143 200 | ( | x | − | 220 | ) | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) | = | 81700000 |
| 方程左边 = | 143 200 | x | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) | − | 143 200 | × | 220 | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) |
| = | 143 200 | x | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) | − | 1573 10 | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) |
| = | 143 200 | x | x | ( | x | − | 220 | ) | ÷ | 2 | + | 143 200 | x | x | × | 220 | − | 1573 10 | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) |
| = | 143 400 | x | x | ( | x | − | 220 | ) | + | 1573 10 | x | x | − | 1573 10 | x | ( | ( | x | − | 220 | ) | ÷ | 2 | + | 220 | ) |
| = | 143 400 | x | x | x | − | 143 400 | x | x | × | 220 | + | 1573 10 | x | x | − | 1573 10 |
| = | 143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 10 | x |
| = | 143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 10 | x |
| = | 143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 20 | x |
| = | 143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 20 | x |
| = | 143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 20 | x |
| = | 143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 20 | x |
143 400 | x | x | x | − | 1573 20 | x | x | + | 1573 10 | x | x | − | 1573 20 | x | = | 81700000 |