( | 398 | × | 6 5 | + | 1200 | ) | × | 20 | ÷ | 13 10 | × | 37 20 | x | + | ( | 398 | × | 17 10 | + | 1200 | ) | × | 11 5 | × | 20 | ÷ | 13 10 | × | 37 20 | x | = | 450000 |
方程左边 = | ( | 398 | × | 6 5 | + | 1200 | ) | × | 370 13 | x | + | ( | 398 | × | 17 10 | + | 1200 | ) | × | 814 13 | x |
( | 398 | × | 6 5 | + | 1200 | ) | × | 370 13 | x | + | ( | 398 | × | 17 10 | + | 1200 | ) | × | 814 13 | x | = | 450000 |
方程左边 = | 398 | × | 6 5 | × | 370 13 | x | + | 1200 | × | 370 13 | x | + | ( | 398 | × | 17 10 | + | 1200 | ) | × | 814 13 | x |
= | 176712 13 | x | + | 444000 13 | x | + | ( | 398 | × | 17 10 | + | 1200 | ) | × | 814 13 | x |
= | 620712 13 | x | + | ( | 398 | × | 17 10 | + | 1200 | ) | × | 814 13 | x |
= | 620712 13 | x | + | 398 | × | 17 10 | × | 814 13 | x | + | 1200 | × | 814 13 | x |
= | 620712 13 | x | + | 2753762 65 | x | + | 976800 13 | x |
= | 10741322 65 | x |
10741322 65 | x | = | 450000 |
x | = | 450000 | ÷ | 10741322 65 |
= | 450000 | × | 65 10741322 |
= | 225000 | × | 65 5370661 |
x | = | 14625000 5370661 |
x | = | 2.723128 |