x | − | 550 | − | ( | 1000 | × | 6 100 | ÷ | 12 | + | 1500 | × | 8 100 | ÷ | 12 | + | x | × | 6 100 | ÷ | 12 | ) | = | 50 |
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 | = | 50 |
199 200 | x | = | 50 | + | 565 |
199 200 | x | = | 615 |
x | = | 615 | ÷ | 199 200 |
= | 615 | × | 200 199 |
x | = | 123000 199 |
x | = | 618.090452 |