Kixcertborn2

Verified answer

2/5 + 7/10) ÷ 1/4 -1.3

4+7/10 * 4 - 1.3

11/10 * 4 - 1.3

Сокращаем на 2

11/5 *2 -1.3

11/5 * 2/1 - 1.3

11*2/5*1 - 1.3

22/5 - 1.3

4.4-1.3=3.1

Ответ:3.1