350 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 504 |
方程左边 = | 350 | × | 1 | ( | 1 | + | x | ) | + | 350 | x | ( | 1 | + | x | ) |
= | 350 | ( | 1 | + | x | ) | + | 350 | x | ( | 1 | + | x | ) |
= | 350 | × | 1 | + | 350 | x | + | 350 | x | ( | 1 | + | x | ) |
= | 350 | + | 350 | x | + | 350 | x | ( | 1 | + | x | ) |
= | 350 | + | 350 | x | + | 350 | x | × | 1 | + | 350 | x | x |
= | 350 | + | 350 | x | + | 350 | x | + | 350 | x | x |
= | 350 | + | 700 | x | + | 350 | x | x |
350 | + | 700 | x | + | 350 | x | x | = | 504 |
x1= | - | 11 5 |
x2= | 1 5 |