7 | × | 4500 | + | 5 | ( | 1 | − | 3 | ÷ | 4 | × | a% | ) | × | 2500 | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) | = | ( | 7 | × | 4500 | + | 5 | × | 2500 | ) | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
方程左边 = | 31500 | + | 12500 | ( | 1 | − | 3 | ÷ | 4 | × | a% | ) | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) |
31500 | + | 12500 | ( | 1 | − | 3 | ÷ | 4 | × | a% | ) | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) | = | ( | 7 | × | 4500 | + | 5 | × | 2500 | ) | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
方程左边 = | 31500 | + | 12500 | × | 1 | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) | − | 12500 | × | 3 | ÷ | 4 | × | a% | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) |
= | 31500 | + | 12500 | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) | − | 375 4 | a | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) |
= | 31500 | + | 12500 | × | 1 | + | 12500 | × | 5 | ÷ | 2 | × | a% | − | 375 4 | a | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) |
= | 31500 | + | 12500 | + | 625 2 | a | − | 375 4 | a | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) |
= | 44000 | + | 625 2 | a | − | 375 4 | a | ( | 1 | + | 5 | ÷ | 2 | × | a% | ) |
= | 44000 | + | 625 2 | a | − | 375 4 | a | × | 1 | − | 375 4 | a | × | 5 | ÷ | 2 | × | a% |
= | 44000 | + | 625 2 | a | − | 375 4 | a | − | 75 32 | a | a |
= | 44000 | + | 875 4 | a | − | 75 32 | a | a |
44000 | + | 875 4 | a | − | 75 32 | a | a | = | ( | 7 | × | 4500 | + | 5 | × | 2500 | ) | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
方程右边 = | 7 | × | 4500 | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) | + | 5 | × | 2500 | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
= | 31500 | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) | + | 12500 | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
= | 31500 | × | 1 | + | 31500 | × | 5 | ÷ | 11 | × | a% | + | 12500 | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
= | 31500 | + | 1575 11 | a | + | 12500 | ( | 1 | + | 5 | ÷ | 11 | × | a% | ) |
= | 31500 | + | 1575 11 | a | + | 12500 | × | 1 | + | 12500 | × | 5 | ÷ | 11 | × | a% |
= | 31500 | + | 1575 11 | a | + | 12500 | + | 625 11 | a |
= | 44000 | + | 200 | a |
44000 | + | 875 4 | a | − | 75 32 | a | a | = | 44000 | + | 200 | a |