157 100 | × | 9 | ( | X | ) | + | 31 20 | × | 30 | ( | X | − | 100 | ) | + | 31 20 | × | 90 | × | 1400 | + | 156 | × | 157 100 | × | 1300 | = | 600000 |
方程左边 = | 1413 100 | ( | X | ) | + | 93 2 | ( | X | − | 100 | ) | + | 195300 | + | 318396 |
= | 1413 100 | ( | X | ) | + | 93 2 | ( | X | − | 100 | ) | + | 513696 |
1413 100 | ( | X | ) | + | 93 2 | ( | X | − | 100 | ) | + | 513696 | = | 600000 |
方程左边 = | 1413 100 | X | + | 93 2 | ( | X | − | 100 | ) | + | 513696 |
= | 1413 100 | X | + | 93 2 | X | − | 93 2 | × | 100 | + | 513696 |
= | 1413 100 | X | + | 93 2 | X | − | 4650 | + | 513696 |
= | 6063 100 | X | + | 509046 |
6063 100 | X | + | 509046 | = | 600000 |
6063 100 | X | = | 600000 | − | 509046 |
6063 100 | X | = | 90954 |
X | = | 90954 | ÷ | 6063 100 |
= | 90954 | × | 100 6063 |
= | 30318 | × | 100 2021 |
X | = | 3031800 2021 |
X | = | 1500.148441 |