( | - | 200 | ( | 16 | + | a | ÷ | 2 | ) | + | 5000 | ) | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 2000 | = | 12112 |
方程左边 = | - | 200 | ( | 16 | + | a | ÷ | 2 | ) | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 2000 |
= | - | 200 | × | 16 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 200 | a | ÷ | 2 | × | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 2000 |
= | - | 3200 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 100 | a | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 2000 |
= | - | 3200 | × | 16 | + | 3200 | × | 7 | + | 3200 | a | ÷ | 2 | − | 100 | a | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) |
= | - | 51200 | + | 22400 | + | 1600 | a | − | 100 | a | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | − | 2000 |
= | - | 30800 | + | 1600 | a | − | 100 | a | ( | 16 | − | 7 | − | a | ÷ | 2 | ) | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) |
= | - | 30800 | + | 1600 | a | − | 100 | a | × | 16 | + | 100 | a | × | 7 | + | 100 | a | a |
= | - | 30800 | + | 1600 | a | − | 1600 | a | + | 700 | a | + | 50 | a | a | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) |
= | - | 30800 | + | 700 | a | + | 50 | a | a | + | 5000 | ( | 16 | − | 7 | − | a | ÷ | 2 | ) |
= | - | 30800 | + | 700 | a | + | 50 | a | a | + | 5000 | × | 16 | − | 5000 | × | 7 | − | 5000 | a |
= | - | 30800 | + | 700 | a | + | 50 | a | a | + | 80000 | − | 35000 | − | 2500 | a |
= | 14200 | − | 1800 | a | + | 50 | a | a |
14200 | − | 1800 | a | + | 50 | a | a | = | 12112 |
a1= | 6 5 |
a2= | 174 5 |