20 | ÷ | 87 | + | X | ÷ | 126 | − | ( | 75 | − | X | ) | ÷ | 500 | = | 381 1000 |
方程左边 = | 20 87 | + | X | × | 1 126 | − | ( | 75 | − | X | ) | × | 1 500 |
20 87 | + | 1 126 | X | − | ( | 75 | − | X | ) | × | 1 500 | = | 381 1000 |
方程左边 = | 20 87 | + | 1 126 | X | − | 75 | × | 1 500 | + | X | × | 1 500 |
= | 20 87 | + | 1 126 | X | − | 3 20 | + | X | × | 1 500 |
= | 139 1740 | + | 313 31500 | X |
139 1740 | + | 313 31500 | X | = | 381 1000 |
313 31500 | X | = | 381 1000 | − | 139 1740 |
313 31500 | X | = | 26197 87000 |
X | = | 26197 87000 | ÷ | 313 31500 |
= | 26197 87000 | × | 31500 313 |
= | 26197 58 | × | 21 313 |
X | = | 550137 18154 |
X | = | 30.3039 |