Question

(15 4/5-9 3/10)-(12 9/10-8 3/5) = помогите​

Answer 1

Ответ:

$2\frac{1}{5}$ или 2,2

Пошаговое объяснение:

$(15 \frac{4}{5} - 9\frac{3}{10} ) - (12\frac{9}{10} - 8\frac{3}{5} )$

1. $15 \frac{4}{5} - 9\frac{3}{10} = 15 \frac{4*2}{5*2} - 9\frac{3}{10} = (15-9) \frac{8}{10} - \frac{3}{10} = 6 \frac{8-3}{10} = 6\frac{5}{10}$
2. $12\frac{9}{10} - 8\frac{3}{5} = 12\frac{9}{10} - 8\frac{3*2}{5*2} = 12\frac{9}{10} -  8\frac{6}{10} = (12-8) \frac{9-6}{10} = 4\frac{3}{10}$
3. $6\frac{5}{10} - 4\frac{3}{10} = (6-4) \frac{5-3}{10} = 2 \frac{2}{10} = 2\frac{1}{5}$