2000 | ( | 1 | + | x | ) | × | 10 | ( | 1 | + | 2 | x | ) | = | 60000 |
方程左边 = | 20000 | ( | 1 | + | x | ) | ( | 1 | + | 2 | x | ) |
20000 | ( | 1 | + | x | ) | ( | 1 | + | 2 | x | ) | = | 60000 |
方程左边 = | 20000 | × | 1 | ( | 1 | + | 2 | x | ) | + | 20000 | x | ( | 1 | + | 2 | x | ) |
= | 20000 | ( | 1 | + | 2 | x | ) | + | 20000 | x | ( | 1 | + | 2 | x | ) |
= | 20000 | × | 1 | + | 20000 | × | 2 | x | + | 20000 | x | ( | 1 | + | 2 | x | ) |
= | 20000 | + | 40000 | x | + | 20000 | x | ( | 1 | + | 2 | x | ) |
= | 20000 | + | 40000 | x | + | 20000 | x | × | 1 | + | 20000 | x | × | 2 | x |
= | 20000 | + | 40000 | x | + | 20000 | x | + | 40000 | x | x |
= | 20000 | + | 60000 | x | + | 40000 | x | x |
20000 | + | 60000 | x | + | 40000 | x | x | = | 60000 |
x2= | 1 2 |