x | = | 15 | ÷ | ( | ( | 1 | + | 40 100 | ) | × | 80 100 | − | 1 | ) |
方程两边同时乘以: | ( | ( | 1 | + | 40 100 | ) | × | 80 100 | − | 1 | ) |
x | ( | ( | 1 | + | 40 100 | ) | × | 80 100 | − | 1 | ) | = | 15 |
x | ( | 1 | + | 40 100 | ) | × | 80 100 | − | x | × | 1 | = | 15 |
x | × | 1 | × | 80 100 | + | x | × | 40 100 | × | 80 100 | − | 1 | x | = | 15 |
x | × | 4 5 | + | x | × | 8 25 | − | 1 | x | = | 15 |
3 25 | x | = | 15 |
x | = | 15 | ÷ | 3 25 |
= | 15 | × | 25 3 |
= | 5 | × | 25 |
x | = | 125 |