480 | ÷ | x | = | 240 | ÷ | x | + | ( | 1 | ÷ | 3 | ) | + | 180 | x | + | ( | 2 | ÷ | 3 | ) |
方程两边同时乘以: | x |
480 | = | 240 | ÷ | 1 | × | 1 | + | ( | 1 | ÷ | 3 | ) | x | + | 180 | x | x | + | ( | 2 | ÷ | 3 | ) | x |
480 | = | 240 | ÷ | 1 | × | 1 | + | 1 | ÷ | 3 | × | x | + | 180 | x | x | + | ( | 2 | ÷ | 3 | ) | x |
480 | = | 240 | + | 1 3 | x | + | 180 | x | x | + | ( | 2 | ÷ | 3 | ) | x |
480 | = | 240 | + | 1 3 | x | + | 180 | x | x | + | 2 | ÷ | 3 | × | x |
480 | = | 240 | + | 1 3 | x | + | 180 | x | x | + | 2 3 | x |
480 | = | 240 | + | 1 | x | + | 180 | x | x |