Y | = | 100 | + | 4 5 | ( | Y | − | 1 4 | Y | + | 125 2 | ) | + | 200 | + | 50 |
方程右边 = | 350 | + | 4 5 | ( | Y | − | 1 4 | Y | + | 125 2 | ) |
Y | = | 350 | + | 4 5 | ( | Y | − | 1 4 | Y | + | 125 2 | ) |
方程右边 = | 350 | + | 4 5 | Y | − | 4 5 | × | 1 4 | Y | + | 4 5 | × | 125 2 |
= | 350 | + | 4 5 | Y | − | 1 5 | Y | + | 50 |
= | 400 | + | 3 5 | Y |
Y | = | 400 | + | 3 5 | Y |
Y | − | 3 5 | Y | = | 400 |
2 5 | Y | = | 400 |
Y | = | 400 | ÷ | 2 5 |
= | 400 | × | 5 2 |
= | 200 | × | 5 |
Y | = | 1000 |