( | 8 5 | x | − | x | ) | × | 200 | + | ( | 13 10 | x | − | x | ) | × | 100 | + | ( | 7 10 | x | − | x | ) | × | 100 | = | 15000 |
方程左边 = | 8 5 | x | × | 200 | − | x | × | 200 | + | ( | 13 10 | x | − | x | ) | × | 100 | + | ( | 7 10 | x | − | x | ) | × | 100 |
= | 320 | x | − | x | × | 200 | + | ( | 13 10 | x | − | x | ) | × | 100 | + | ( | 7 10 | x | − | x | ) | × | 100 |
= | 120 | x | + | ( | 13 10 | x | − | x | ) | × | 100 | + | ( | 7 10 | x | − | x | ) | × | 100 |
= | 120 | x | + | 13 10 | x | × | 100 | − | x | × | 100 | + | ( | 7 10 | x | − | x | ) | × | 100 |
= | 120 | x | + | 130 | x | − | x | × | 100 | + | ( | 7 10 | x | − | x | ) | × | 100 |
= | 150 | x | + | ( | 7 10 | x | − | x | ) | × | 100 |
= | 150 | x | + | 7 10 | x | × | 100 | − | x | × | 100 |
= | 150 | x | + | 70 | x | − | x | × | 100 |
= | 120 | x |
120 | x | = | 15000 |
x | = | 15000 | ÷ | 120 |
= | 15000 | × | 1 120 |
= | 125 | × | 1 |
x | = | 125 |