8 5 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | = | 5 2 |
方程左边 = | 8 5 | × | 1 | ( | 1 | + | X | ) | + | 8 5 | X | ( | 1 | + | X | ) |
= | 8 5 | ( | 1 | + | X | ) | + | 8 5 | X | ( | 1 | + | X | ) |
= | 8 5 | × | 1 | + | 8 5 | X | + | 8 5 | X | ( | 1 | + | X | ) |
= | 8 5 | + | 8 5 | X | + | 8 5 | X | ( | 1 | + | X | ) |
= | 8 5 | + | 8 5 | X | + | 8 5 | X | × | 1 | + | 8 5 | X | X |
= | 8 5 | + | 8 5 | X | + | 8 5 | X | + | 8 5 | X | X |
= | 8 5 | + | 16 5 | X | + | 8 5 | X | X |
8 5 | + | 16 5 | X | + | 8 5 | X | X | = | 5 2 |
X1= | - | 9 4 |
X2= | 1 4 |