140 | × | 393 50 | + | 13 | c | = | ( | 140 | + | c | ) | × | 159 20 |
方程左边 = | 5502 5 | + | 13 | c |
5502 5 | + | 13 | c | = | ( | 140 | + | c | ) | × | 159 20 |
方程右边 = | 140 | × | 159 20 | + | c | × | 159 20 |
= | 1113 | + | c | × | 159 20 |
5502 5 | + | 13 | c | = | 1113 | + | 159 20 | c |
13 | c | − | 159 20 | c | = | 1113 | − | 5502 5 |
101 20 | c | = | 1113 | − | 5502 5 |
101 20 | c | = | 63 5 |
c | = | 63 5 | ÷ | 101 20 |
= | 63 5 | × | 20 101 |
= | 63 | × | 4 101 |
c | = | 252 101 |
c | = | 2.49505 |