7 | × | 4500 | + | 5 | ( | 1 | − | 3 4 | x | ) | ( | 1 | + | 5 2 | x | ) | = | ( | 4500 | × | 7 | + | 2500 | × | 5 | ) | ( | 1 | − | 5 | x | ÷ | 11 | ) |
方程左边 = | 31500 | + | 5 | ( | 1 | − | 3 4 | x | ) | ( | 1 | + | 5 2 | x | ) |
31500 | + | 5 | ( | 1 | − | 3 4 | x | ) | ( | 1 | + | 5 2 | x | ) | = | ( | 4500 | × | 7 | + | 2500 | × | 5 | ) | ( | 1 | − | 5 | x | ÷ | 11 | ) |
方程左边 = | 31500 | + | 5 | × | 1 | ( | 1 | + | 5 2 | x | ) | − | 5 | × | 3 4 | x | ( | 1 | + | 5 2 | x | ) |
= | 31500 | + | 5 | ( | 1 | + | 5 2 | x | ) | − | 15 4 | x | ( | 1 | + | 5 2 | x | ) |
= | 31500 | + | 5 | × | 1 | + | 5 | × | 5 2 | x | − | 15 4 | x | ( | 1 | + | 5 2 | x | ) |
= | 31500 | + | 5 | + | 25 2 | x | − | 15 4 | x | ( | 1 | + | 5 2 | x | ) |
= | 31505 | + | 25 2 | x | − | 15 4 | x | ( | 1 | + | 5 2 | x | ) |
= | 31505 | + | 25 2 | x | − | 15 4 | x | × | 1 | − | 15 4 | x | × | 5 2 | x |
= | 31505 | + | 25 2 | x | − | 15 4 | x | − | 75 8 | x | x |
= | 31505 | + | 35 4 | x | − | 75 8 | x | x |
31505 | + | 35 4 | x | − | 75 8 | x | x | = | ( | 4500 | × | 7 | + | 2500 | × | 5 | ) | ( | 1 | − | 5 | x | ÷ | 11 | ) |
方程右边 = | 4500 | × | 7 | ( | 1 | − | 5 | x | ÷ | 11 | ) | + | 2500 | × | 5 | ( | 1 | − | 5 | x | ÷ | 11 | ) |
= | 31500 | ( | 1 | − | 5 | x | ÷ | 11 | ) | + | 12500 | ( | 1 | − | 5 | x | ÷ | 11 | ) |
= | 31500 | × | 1 | − | 31500 | × | 5 | x | ÷ | 11 | + | 12500 | ( | 1 | − | 5 | x | ÷ | 11 | ) |
= | 31500 | − | 157500 11 | x | + | 12500 | ( | 1 | − | 5 | x | ÷ | 11 | ) |
= | 31500 | − | 157500 11 | x | + | 12500 | × | 1 | − | 12500 | × | 5 | x | ÷ | 11 |
= | 31500 | − | 157500 11 | x | + | 12500 | − | 62500 11 | x |
= | 44000 | − | 20000 | x |
31505 | + | 35 4 | x | − | 75 8 | x | x | = | 44000 | − | 20000 | x |