30 100 | = | ( | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | ) | ÷ | ( | 1 | − | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | ) |
方程两边同时乘以: | ( | 1 | − | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | ) |
30 100 | ( | 1 | − | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | ) | = | ( | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | ) |
30 100 | × | 1 | − | 30 100 | × | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | = | ( | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | ) |
30 100 | × | 1 | − | 30 100 | × | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 | = | 1 5 | × | 2 | ( | 720 | ÷ | X | ) | × | 2 5 |
3 10 | − | 6 125 | ( | 720 | ÷ | X | ) | = | 4 25 | ( | 720 | ÷ | X | ) |
3 10 | − | 6 125 | × | 720 | ÷ | X | = | 4 25 | ( | 720 | ÷ | X | ) |
3 10 | − | 6 125 | × | 720 | ÷ | X | = | 4 25 | × | 720 | ÷ | X |
3 10 | − | 864 25 | ÷ | X | = | 576 5 | ÷ | X |
方程两边同时乘以: | X |
3 10 | X | − | 864 25 | = | 576 5 | ÷ | 1 | × | 1 |
3 10 | X | = | 576 5 | ÷ | 1 | × | 1 | + | 864 25 |
3 10 | X | = | 576 5 | + | 864 25 |
3 10 | X | = | 3744 25 |
X | = | 3744 25 | ÷ | 3 10 |
= | 3744 25 | × | 10 3 |
= | 1248 5 | × | 2 |
X | = | 2496 5 |
X | = | 499.2 |