x | ( | x | ÷ | 4 | + | 1 | ) | ( | x | ÷ | 36 | + | 1 | ) | = | 225 |
方程左边 = | x | x | ÷ | 4 | × | ( | x | ÷ | 36 | + | 1 | ) | + | x | × | 1 | ( | x | ÷ | 36 | + | 1 | ) |
= | x | x | × | 1 4 | x | ÷ | 36 | + | x | x | × | 1 4 | × | 1 | + | x | × | 1 | ( | x | ÷ | 36 | + | 1 | ) |
= | x | x | × | 1 144 | x | + | x | x | × | 1 4 | + | x | × | 1 | ( | x | ÷ | 36 | + | 1 | ) |
= | x | x | × | 1 144 | x | + | x | x | × | 1 4 | + | x | × | 1 | x | ÷ | 36 | + | x |
= | x | x | × | 1 144 | x | + | x | x | × | 1 4 | + | x | × | 1 36 | x | + | x | × | 1 |
x | x | × | 1 144 | x | + | x | x | × | 1 4 | + | x | × | 1 36 | x | + | 1 | x | = | 225 |