100 | x | − | 4 | = | ( | 115 | x | − | 4 | ) | ( | 1 | + | x | ) |
方程右边 = | 115 | x | ( | 1 | + | x | ) | − | 4 | ( | 1 | + | x | ) |
= | 115 | x | × | 1 | + | 115 | x | x | − | 4 | ( | 1 | + | x | ) |
= | 115 | x | + | 115 | x | x | − | 4 | ( | 1 | + | x | ) |
= | 115 | x | + | 115 | x | x | − | 4 | × | 1 | − | 4 | x |
= | 115 | x | + | 115 | x | x | − | 4 | − | 4 | x |
= | 111 | x | + | 115 | x | x | − | 4 |
100 | x | − | 4 | = | 111 | x | + | 115 | x | x | − | 4 |
x1=0 |