M | × | 30 | × | 36 100 | × | 70 100 | = | 40000 | + | M | × | 30 | × | 6 100 |
方程左边 = | M | × | 189 25 |
189 25 | M | = | 40000 | + | M | × | 30 | × | 6 100 |
方程右边 = | 40000 | + | M | × | 9 5 |
189 25 | M | = | 40000 | + | 9 5 | M |
189 25 | M | − | 9 5 | M | = | 40000 |
144 25 | M | = | 40000 |
M | = | 40000 | ÷ | 144 25 |
= | 40000 | × | 25 144 |
= | 2500 | × | 25 9 |
M | = | 62500 9 |
M | = | 6944.444444 |