Y | × | 3 10 | ÷ | 3 100 | − | ( | Y | × | 3 10 | ÷ | 3 100 | ) | × | 60 100 | − | 489 | = | 0 |
方程左边 = | Y | × | 10 | − | ( | Y | × | 3 10 | ÷ | 3 100 | ) | × | 60 100 | − | 489 |
10 | Y | − | ( | Y | × | 3 10 | ÷ | 3 100 | ) | × | 60 100 | − | 489 | = | 0 |
方程左边 = | 10 | Y | − | Y | × | 3 10 | ÷ | 3 100 | × | 60 100 | − | 489 |
= | 10 | Y | − | Y | × | 6 | − | 489 |
= | 4 | Y | − | 489 |
4 | Y | − | 489 | = | 0 |
4 | Y | = | 0 | + | 489 |
4 | Y | = | 489 |
Y | = | 489 | ÷ | 4 |
= | 489 | × | 1 4 |
Y | = | 489 4 |
Y | = | 122.25 |