( | 505 | + | X | ) | ÷ | ( | 1107 | + | X | ) | = | 3 5 |
方程两边同时乘以: | ( | 1107 | + | X | ) |
( | 505 | + | X | ) | = | 3 5 | ( | 1107 | + | X | ) |
505 | + | X | = | 3 5 | ( | 1107 | + | X | ) |
505 | + | X | = | 3 5 | × | 1107 | + | 3 5 | X |
505 | + | X | = | 3321 5 | + | 3 5 | X |
X | − | 3 5 | X | = | 3321 5 | − | 505 |
2 5 | X | = | 3321 5 | − | 505 |
2 5 | X | = | 796 5 |
X | = | 796 5 | ÷ | 2 5 |
= | 796 5 | × | 5 2 |
= | 398 | × | 1 |
X | = | 398 |