2500 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 6666 |
方程左边 = | 2500 | × | 1 | ( | 1 | + | x | ) | + | 2500 | x | ( | 1 | + | x | ) |
= | 2500 | ( | 1 | + | x | ) | + | 2500 | x | ( | 1 | + | x | ) |
= | 2500 | × | 1 | + | 2500 | x | + | 2500 | x | ( | 1 | + | x | ) |
= | 2500 | + | 2500 | x | + | 2500 | x | ( | 1 | + | x | ) |
= | 2500 | + | 2500 | x | + | 2500 | x | × | 1 | + | 2500 | x | x |
= | 2500 | + | 2500 | x | + | 2500 | x | + | 2500 | x | x |
= | 2500 | + | 5000 | x | + | 2500 | x | x |
2500 | + | 5000 | x | + | 2500 | x | x | = | 6666 |