42 5 | × | 42 5 | x | − | x | ( | 3 5 | + | 2 | × | 71 200 | ) | ( | 3 5 | + | 2 | × | 71 200 | ) | = | 1065603 500 |
| 方程左边 = | 1764 25 | x | − | x | ( | 3 5 | + | 2 | × | 71 200 | ) | ( | 3 5 | + | 2 | × | 71 200 | ) |
1764 25 | x | − | x | ( | 3 5 | + | 2 | × | 71 200 | ) | ( | 3 5 | + | 2 | × | 71 200 | ) | = | 1065603 500 |
| 方程左边 = | 1764 25 | x | − | x | × | 3 5 | ( | 3 5 | + | 2 | × | 71 200 | ) | − | x | × | 2 | × | 71 200 | ( | 3 5 | + | 2 | × | 71 200 | ) |
| = | 1764 25 | x | − | x | × | 3 5 | ( | 3 5 | + | 2 | × | 71 200 | ) | − | x | × | 71 100 | ( | 3 5 | + | 2 | × | 71 200 | ) |
| = | 1764 25 | x | − | x | × | 3 5 | × | 3 5 | − | x | × | 3 5 | × | 2 | × | 71 200 | − | x | × | 71 100 | ( | 3 5 | + | 2 | × | 71 200 | ) |
| = | 1764 25 | x | − | x | × | 9 25 | − | x | × | 213 500 | − | x | × | 71 100 | ( | 3 5 | + | 2 | × | 71 200 | ) |
| = | 34887 500 | x | − | x | × | 71 100 | ( | 3 5 | + | 2 | × | 71 200 | ) |
| = | 34887 500 | x | − | x | × | 71 100 | × | 3 5 | − | x | × | 71 100 | × | 2 | × | 71 200 |
| = | 34887 500 | x | − | x | × | 213 500 | − | x | × | 5041 10000 |
| = | 688439 10000 | x |
688439 10000 | x | = | 1065603 500 |
| x | = | 1065603 500 | ÷ | 688439 10000 |
| = | 1065603 500 | × | 10000 688439 |
| = | 1065603 | × | 20 688439 |
| x | = | 21312060 688439 |
| x | = | 30.957078 |