55 | × | 159 20 | + | 15 | × | 393 50 | + | 90 | x | = | 160 | × | 399 50 |
方程左边 = | 1749 4 | + | 1179 10 | + | 90 | x |
= | 11103 20 | + | 90 | x |
11103 20 | + | 90 | x | = | 160 | × | 399 50 |
方程右边 = | 6384 5 |
11103 20 | + | 90 | x | = | 6384 5 |
90 | x | = | 6384 5 | − | 11103 20 |
90 | x | = | 14433 20 |
x | = | 14433 20 | ÷ | 90 |
= | 14433 20 | × | 1 90 |
= | 4811 20 | × | 1 30 |
x | = | 4811 600 |
x | = | 8.018333 |