(3.1/3+5.1/6)*2/5-2.3/4:(1.1/2-2/5)​

Пошаговое объяснение:

1. (3.1/3+5.1/6)*2/5 = (3.2/6+5.1/6)*2/5= 8.3/6 * 2/5 = 51/6 * 2/5 = 102/30 = 34/10

2. 2.3/4:(1.1/2-2/5)= 2.3/4:(1.5/10-4/10)= 2.3/4 : 1.1/10 =11/4 * 10/11 = 110/44 = 55/22 = 5/2

3. 34/10 - 5/2 =34/10 - 25/10 =9/10

ответ: 9/10 или 0,9