1700 | ( | 1 | + | x | ) | ( | 1 | + | 2 | x | ) | = | 2856 |
方程左边 = | 1700 | × | 1 | ( | 1 | + | 2 | x | ) | + | 1700 | x | ( | 1 | + | 2 | x | ) |
= | 1700 | ( | 1 | + | 2 | x | ) | + | 1700 | x | ( | 1 | + | 2 | x | ) |
= | 1700 | × | 1 | + | 1700 | × | 2 | x | + | 1700 | x | ( | 1 | + | 2 | x | ) |
= | 1700 | + | 3400 | x | + | 1700 | x | ( | 1 | + | 2 | x | ) |
= | 1700 | + | 3400 | x | + | 1700 | x | × | 1 | + | 1700 | x | × | 2 | x |
= | 1700 | + | 3400 | x | + | 1700 | x | + | 3400 | x | x |
= | 1700 | + | 5100 | x | + | 3400 | x | x |
1700 | + | 5100 | x | + | 3400 | x | x | = | 2856 |
x1= | - | 17 10 |
x2= | 1 5 |