256 | ( | x | + | 1 | ) | ( | x | + | 1 | ) | = | 400 |
方程左边 = | 256 | x | ( | x | + | 1 | ) | + | 256 | × | 1 | ( | x | + | 1 | ) |
= | 256 | x | ( | x | + | 1 | ) | + | 256 | ( | x | + | 1 | ) |
= | 256 | x | x | + | 256 | x | × | 1 | + | 256 | ( | x | + | 1 | ) |
= | 256 | x | x | + | 256 | x | + | 256 | ( | x | + | 1 | ) |
= | 256 | x | x | + | 256 | x | + | 256 | x | + | 256 | × | 1 |
= | 256 | x | x | + | 256 | x | + | 256 | x | + | 256 |
= | 256 | x | x | + | 512 | x | + | 256 |
256 | x | x | + | 512 | x | + | 256 | = | 400 |
x1= | - | 9 4 |
x2= | 1 4 |