( | x | ÷ | ( | 20 | ) | + | x | ÷ | ( | 30 | ) | ) | × | 4 | = | 10 |
x | ÷ | ( | 20 | ) | × | 4 | + | x | ÷ | ( | 30 | ) | × | 4 | = | 10 |
方程两边同时乘以: | ( | 20 | ) |
x | × | 4 | + | x | ÷ | ( | 30 | ) | × | 4 | ( | 20 | ) | = | 10 | ( | 20 | ) |
x | × | 4 | + | x | ÷ | ( | 30 | ) | × | 4 | × | 20 | = | 10 | ( | 20 | ) |
x | × | 4 | + | x | ÷ | ( | 30 | ) | × | 4 | × | 20 | = | 10 | × | 20 |
x | × | 4 | + | x | ÷ | ( | 30 | ) | × | 80 | = | 200 |
方程两边同时乘以: | ( | 30 | ) |
4 | x | ( | 30 | ) | + | x | × | 80 | = | 200 | ( | 30 | ) |
4 | x | × | 30 | + | x | × | 80 | = | 200 | ( | 30 | ) |
4 | x | × | 30 | + | x | × | 80 | = | 200 | × | 30 |
120 | x | + | x | × | 80 | = | 6000 |
200 | x | = | 6000 |
x | = | 6000 | ÷ | 200 |
= | 6000 | × | 1 200 |
= | 30 | × | 1 |
x | = | 30 |