X | ÷ | 87 | − | ( | 100 | − | X | ) | ÷ | 1000 | = | 381 1000 |
方程左边 = | 1 87 | X | − | 100 | × | 1 1000 | + | X | × | 1 1000 |
= | 1 87 | X | − | 1 10 | + | X | × | 1 1000 |
= | 1087 87000 | X | − | 1 10 |
1087 87000 | X | − | 1 10 | = | 381 1000 |
1087 87000 | X | = | 381 1000 | + | 1 10 |
1087 87000 | X | = | 481 1000 |
X | = | 481 1000 | ÷ | 1087 87000 |
= | 481 1000 | × | 87000 1087 |
= | 481 | × | 87 1087 |
X | = | 41847 1087 |
X | = | 38.4977 |