1990 | + | X | + | ( | 1990 | + | X | ) | ÷ | 26 | × | 13 10 | = | 3000 |
方程左边 = | 1990 | + | X | + | ( | 1990 | + | X | ) | × | 1 20 |
1990 | + | X | + | ( | 1990 | + | X | ) | × | 1 20 | = | 3000 |
方程左边 = | 1990 | + | X | + | 1990 | × | 1 20 | + | X | × | 1 20 |
= | 1990 | + | X | + | 199 2 | + | X | × | 1 20 |
= | 4179 2 | + | 21 20 | X |
4179 2 | + | 21 20 | X | = | 3000 |
21 20 | X | = | 3000 | − | 4179 2 |
21 20 | X | = | 1821 2 |
X | = | 1821 2 | ÷ | 21 20 |
= | 1821 2 | × | 20 21 |
= | 607 | × | 10 7 |
X | = | 6070 7 |
X | = | 867.142857 |