X | − | 550 | − | ( | 1000 | × | 6 100 | ÷ | 12 | + | 1500 | × | 8 100 | ÷ | 12 | + | X | × | 6 100 | ÷ | 12 | ) | = | 0 |
方程左边 = | X | − | 550 | − | 1000 | × | 6 100 | ÷ | 12 | − | 1500 | × | 8 100 | ÷ | 12 | − | X | × | 6 100 | ÷ | 12 |
= | X | − | 550 | − | 5 | − | 10 | − | X | × | 1 200 |
= | 199 200 | X | − | 565 |
199 200 | X | − | 565 | = | 0 |
199 200 | X | = | 0 | + | 565 |
199 200 | X | = | 565 |
X | = | 565 | ÷ | 199 200 |
= | 565 | × | 200 199 |
X | = | 113000 199 |
X | = | 567.839196 |