Question

2,5*4/9+1,8*5/9
Помогите / - это дробь

Answer 1

1)2,5=2 5/10 * 4/9=25/10 *4/9 =100/90 =1 10/90
2) 1 8/10*5/9=18/10*5/9=10/10=1
3)1 10/90+1=2 10/90

Answer 2

Здравствуйте!
$2.5 \times \frac{4}{9} + 1.8 \times \frac{5}{9} = 2 \frac{5}{10} \times \frac{4}{9} + 1 \frac{8}{10} \times \frac{5}{9} = \frac{25}{10} \times \frac{4}{9} + \frac{18}{10} \times \frac{5}{9} = \frac{25 \times 4}{10 \times 9} + \frac{18 \times 5}{10 \times 9} = \frac{5 \times 2}{9} + \frac{2}{2} = \frac{10}{9} + 1 = 2\frac{1}{9}$
ОТВЕТ: 2 1/9.