( | 497 500 | − | 769 1000 | ) | × | 100 | + | ( | 497 500 | − | x | ) | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 | + | 1 10 | + | 1 10 | + | 1 5 | + | 1 5 | = | ( | 497 500 | − | 769 1000 | ) | × | 300 | + | 1 10 |
方程左边 = | ( | 497 500 | − | 769 1000 | ) | × | 100 | + | ( | 497 500 | − | x | ) | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 | + | 3 5 |
( | 497 500 | − | 769 1000 | ) | × | 100 | + | ( | 497 500 | − | x | ) | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 | + | 3 5 | = | ( | 497 500 | − | 769 1000 | ) | × | 300 | + | 1 10 |
方程左边 = | 497 500 | × | 100 | − | 769 1000 | × | 100 | + | ( | 497 500 | − | x | ) | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 | + | 3 5 |
= | 497 5 | − | 769 10 | + | ( | 497 500 | − | x | ) | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 | + | 3 5 |
= | 231 10 | + | ( | 497 500 | − | x | ) | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 231 10 | + | 497 500 | × | 200 | − | x | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 231 10 | + | 994 5 | − | x | × | 200 | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 2219 10 | − | 200 | x | + | ( | 409 500 | − | 79 100 | ) | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 2219 10 | − | 200 | x | + | 409 500 | × | 300 | − | 79 100 | × | 300 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 2219 10 | − | 200 | x | + | 1227 5 | − | 237 | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 2303 10 | − | 200 | x | + | ( | 819 1000 | − | 79 100 | ) | × | 300 |
= | 2303 10 | − | 200 | x | + | 819 1000 | × | 300 | − | 79 100 | × | 300 |
= | 2303 10 | − | 200 | x | + | 2457 10 | − | 237 |
= | 239 | − | 200 | x |
239 | − | 200 | x | = | ( | 497 500 | − | 769 1000 | ) | × | 300 | + | 1 10 |
方程右边 = | 497 500 | × | 300 | − | 769 1000 | × | 300 | + | 1 10 |
= | 1491 5 | − | 2307 10 | + | 1 10 |
= | 338 5 |
239 | − | 200 | x | = | 338 5 |
- | 200 | x | = | 338 5 | − | 239 |
- | 200 | x | = | - | 857 5 |
857 5 | = | 200 | x |
200 | x | = | 857 5 |
x | = | 857 5 | ÷ | 200 |
= | 857 5 | × | 1 200 |
x | = | 857 1000 |
x | = | 0.857 |