1200 | = | 120 | ÷ | i | × | ( | 1 | − | 1 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | 20 | ) | + | 1000 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | 20 |
方程两边同时乘以: | i |
1200 | i | = | 120 | ( | 1 | − | 1 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | 20 | ) | + | 1000 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | 20 | i |
1200 | i | = | 120 | × | 1 | − | 120 | × | 1 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | 20 | + | 1000 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | 20 | i |
1200 | i | = | 120 | − | 2400 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | + | 20000 | ÷ | ( | 1 | + | i | ÷ | 2 | ) | × | i |
方程两边同时乘以: | ( | 1 | + | i | ÷ | 2 | ) |
1200 | i | ( | 1 | + | i | ÷ | 2 | ) | = | 120 | ( | 1 | + | i | ÷ | 2 | ) | − | 2400 | + | 20000 | i |
1200 | i | × | 1 | + | 1200 | i | i | ÷ | 2 | = | 120 | ( | 1 | + | i | ÷ | 2 | ) | − | 2400 | + | 20000 | i |
1200 | i | × | 1 | + | 1200 | i | i | ÷ | 2 | = | 120 | × | 1 | + | 120 | i | ÷ | 2 | − | 2400 | + | 20000 | i |
1200 | i | + | 600 | i | i | = | 120 | + | 60 | i | − | 2400 | + | 20000 | i |
1200 | i | + | 600 | i | i | = | - | 2280 | + | 20060 | i |