( | 12000 | + | x | + | 3000 | + | 180 | ) | × | 13 100 | + | 12000 | + | x | + | 3180 | = | 18740 |
方程左边 = | ( | 12000 | + | x | + | 3000 | + | 180 | ) | × | 13 100 | + | 15180 | + | x |
( | 12000 | + | x | + | 3000 | + | 180 | ) | × | 13 100 | + | 15180 | + | x | = | 18740 |
方程左边 = | 12000 | × | 13 100 | + | x | × | 13 100 | + | 3000 | × | 13 100 | + | 180 | × | 13 100 | + | 15180 | + | x |
= | 1560 | + | x | × | 13 100 | + | 390 | + | 117 5 | + | 15180 | + | x |
= | 85767 5 | + | 113 100 | x |
85767 5 | + | 113 100 | x | = | 18740 |
113 100 | x | = | 18740 | − | 85767 5 |
113 100 | x | = | 7933 5 |
x | = | 7933 5 | ÷ | 113 100 |
= | 7933 5 | × | 100 113 |
= | 7933 | × | 20 113 |
x | = | 158660 113 |
x | = | 1404.070796 |