40 | ( | 1 | − | 1 2 | × | 0 | x | ) | × | 400 | ( | 1 | + | 0 | x | ) | + | 50 | ( | 1 | − | 2 | × | 0 | x | ) | × | 400 | ( | 1 | + | 8 5 | × | 0 | x | ) | = | 36000 |
方程左边 = | 16000 | ( | 1 | − | 1 2 | × | 0 | x | ) | ( | 1 | + | 0 | x | ) | + | 20000 | ( | 1 | − | 2 | × | 0 | x | ) | ( | 1 | + | 8 5 | × | 0 | x | ) |
16000 | ( | 1 | − | 1 2 | × | 0 | x | ) | ( | 1 | + | 0 | x | ) | + | 20000 | ( | 1 | − | 2 | × | 0 | x | ) | ( | 1 | + | 8 5 | × | 0 | x | ) | = | 36000 |
方程左边 = | 16000 | × | 1 | ( | 1 | + | 0 | x | ) | − | 16000 | × | 1 2 | × | 0 | x | ( | 1 | + | 0 | x | ) | + | 20000 | ( | 1 | − | 2 | × | 0 | x | ) | ( | 1 | + | 8 5 | × | 0 | x | ) |
= | 16000 | ( | 1 | + | 0 | x | ) | − | 0 | x | ( | 1 | + | 0 | x | ) | + | 20000 | ( | 1 | − | 2 | × | 0 | x | ) | ( | 1 | + | 8 5 | × | 0 | x | ) |
= | 16000 | × | 1 | + | 16000 | × | 0 | x | − | 0 | x | ( | 1 | + | 0 | x | ) | + | 20000 | ( | 1 | − | 2 | × | 0 | x | ) | ( | 1 | + | 8 5 | × | 0 | x | ) |
= | 16000 | + | 0 | x | − | 0 | x | ( | 1 | + | 0 | x | ) | + | 20000 | ( | 1 | − | 2 | × | 0 | x | ) | ( | 1 | + | 8 5 | × | 0 | x | ) |
= | 16000 | + | 20000 | × | 1 | ( | 1 | + | 8 5 | × | 0 | x | ) | − | 20000 | × | 2 | × | 0 | x | ( | 1 | + | 8 5 | × | 0 | x | ) |
= | 16000 | + | 20000 | ( | 1 | + | 8 5 | × | 0 | x | ) | − | 0 | x | ( | 1 | + | 8 5 | × | 0 | x | ) |
= | 16000 | + | 20000 | × | 1 | + | 20000 | × | 8 5 | × | 0 | x |
= | 16000 | + | 20000 | + | 0 | x |
= | 36000 | + | 0 | x |
36000 | = | 36000 |
= | 36000 | − | 36000 |