( | 5 | ( | 43 | + | X | ) | + | 2 | × | 4 | + | 3 | × | 3 | + | 1 | × | 2 | ) | ÷ | ( | 9 | + | X | ) | = | 49 10 |
方程两边同时乘以: | ( | 9 | + | X | ) |
( | 5 | ( | 43 | + | X | ) | + | 2 | × | 4 | + | 3 | × | 3 | + | 1 | × | 2 | ) | = | 49 10 | ( | 9 | + | X | ) |
5 | ( | 43 | + | X | ) | + | 2 | × | 4 | + | 3 | × | 3 | + | 1 | × | 2 | = | 49 10 | ( | 9 | + | X | ) |
5 | ( | 43 | + | X | ) | + | 2 | × | 4 | + | 3 | × | 3 | + | 1 | × | 2 | = | 49 10 | × | 9 | + | 49 10 | X |
5 | ( | 43 | + | X | ) | + | 8 | + | 9 | + | 2 | = | 441 10 | + | 49 10 | X |
5 | ( | 43 | + | X | ) | + | 19 | = | 441 10 | + | 49 10 | X |
5 | × | 43 | + | 5 | X | + | 19 | = | 441 10 | + | 49 10 | X |
215 | + | 5 | X | + | 19 | = | 441 10 | + | 49 10 | X |
234 | + | 5 | X | = | 441 10 | + | 49 10 | X |
5 | X | − | 49 10 | X | = | 441 10 | − | 234 |
1 10 | X | = | 441 10 | − | 234 |
1 10 | X | = | - | 1899 10 |
X | = | - | 1899 10 | ÷ | 1 10 |
= | - | 1899 10 | × | 10 |
= | - | 1899 | × | 1 |
X | = | - | 1899 |