20000 | ÷ | b | + | 17600 | ÷ | ( | b | + | 30 | ) | = | 10000 | ÷ | 70 |
方程两边同时乘以: | b |
20000 | + | 17600 | ÷ | ( | b | + | 30 | ) | × | b | = | 10000 | ÷ | 70 | × | b |
方程两边同时乘以: | ( | b | + | 30 | ) |
20000 | ( | b | + | 30 | ) | + | 17600 | b | = | 10000 | ÷ | 70 | × | b | ( | b | + | 30 | ) |
20000 | b | + | 20000 | × | 30 | + | 17600 | b | = | 10000 | ÷ | 70 | × | b | ( | b | + | 30 | ) |
20000 | b | + | 20000 | × | 30 | + | 17600 | b | = | 10000 | ÷ | 70 | × | b | b | + | 10000 | ÷ | 70 | × | b | × | 30 |
20000 | b | + | 600000 | + | 17600 | b | = | 1000 7 | b | b | + | 30000 7 | b |
37600 | b | + | 600000 | = | 1000 7 | b | b | + | 30000 7 | b |
b1= | - | 84 5 |