x | x | ( | 1 | + | 1 25 | x | x | ) | ( | 1 | + | 1 400 | x | x | ) | = | 36 |
方程左边 = | x | x | × | 1 | ( | 1 | + | 1 400 | x | x | ) | + | x | x | × | 1 25 | x | x | ( | 1 | + | 1 400 | x | x | ) |
= | x | x | × | 1 | × | 1 | + | x | x | × | 1 | × | 1 400 | x | x | + | x | x |
= | x | x | × | 1 | + | x | x | × | 1 400 | x | x | + | x | x | × | 1 25 | x |
= | x | x | × | 1 | + | x | x | × | 1 400 | x | x | + | x | x | × | 1 25 | x |
= | x | x | × | 1 | + | x | x | × | 1 400 | x | x | + | x | x | × | 1 25 | x |
x | x | × | 1 | + | x | x | × | 1 400 | x | x | + | x | x | × | 1 25 | x | = | 36 |