Question

25/18-47/30
/-дробная черта

Answer 1

$\frac{25}{18} - \frac{47}{30} = \frac{25 \times 5}{18 \times 5} - \frac{47 \times 3}{30 \times 3} = \\ = \frac{125}{90} - \frac{141}{90} = \frac{125 - 141}{90} = \\ = \frac{ - 16}{90} = - \frac{16}{90} = - \frac{8}{45}$

Answer 2

25/18 - 47/30 = 125/90 - 141/90 = -16/90