| 20640 | − | ( | 1600 | + | 10 | A | ) | × | 3 4 | + | 321 2 | + | 22710 | − | ( | 1720 | + | 11 | A | ) | × | 3 4 | + | 1053 10 | + | 24987 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 | + | 50271 5 | = | 17520 |
| 方程左边 = | 78657 | − | ( | 1600 | + | 10 | A | ) | × | 3 4 | − | ( | 1720 | + | 11 | A | ) | × | 3 4 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| 78657 | − | ( | 1600 | + | 10 | A | ) | × | 3 4 | − | ( | 1720 | + | 11 | A | ) | × | 3 4 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 | = | 17520 |
| 方程左边 = | 78657 | − | 1600 | × | 3 4 | − | 10 | A | × | 3 4 | − | ( | 1720 | + | 11 | A | ) | × | 3 4 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| = | 78657 | − | 1200 | − | 15 2 | A | − | ( | 1720 | + | 11 | A | ) | × | 3 4 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| = | 77457 | − | 15 2 | A | − | ( | 1720 | + | 11 | A | ) | × | 3 4 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| = | 77457 | − | 15 2 | A | − | 1720 | × | 3 4 | − | 11 | A | × | 3 4 | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| = | 77457 | − | 15 2 | A | − | 1290 | − | 33 4 | A | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| = | 76167 | − | 63 4 | A | − | ( | 121 10 | A | + | 1852 | ) | × | 37 50 |
| = | 76167 | − | 63 4 | A | − | 121 10 | A | × | 37 50 | − | 1852 | × | 37 50 |
| = | 76167 | − | 63 4 | A | − | 4477 500 | A | − | 34262 25 |
| = | 1869913 25 | − | 3088 125 | A |
1869913 25 | − | 3088 125 | A | = | 17520 |
| - | 3088 125 | A | = | 17520 | − | 1869913 25 |
| - | 3088 125 | A | = | - | 1431913 25 |
1431913 25 | = | 3088 125 | A |
3088 125 | A | = | 1431913 25 |
| A | = | 1431913 25 | ÷ | 3088 125 |
| = | 1431913 25 | × | 125 3088 |
| = | 1431913 | × | 5 3088 |
| A | = | 7159565 3088 |
| A | = | 2318.511982 |