Выполни действия: 3/8 * 4/5 / 9/10 ; 2целых2/11 * 1 целую3/8 / 3/4; 3/5 * (2 целых2/3 / 3 целых 1/5).

3/8 * 4/5 : 9/10 = 1/3.

1). 3/8 * 4/5 = (3 * 4) / (8 * 5) = 12/40 = 3/10;

2). 3/10 : 9/10 = 3/10 * 10/9 = (3 * 10) / (10 * 9) = 30/90 = 3/9 = 1/3.

Ответ: 1/3.

2 2/11 * 1 3/8 : 3/4 = 4.

1). 2 2/11 * 1 3/8 = 24/11 * 11/8 = (24 * 11) / (11 * 8) = 264/88 = 24/8 = 3; 

2). 3 : 3/4 = 3 * 4/3 = (3 * 4) / 3 = 12/3 = 4.

Ответ: 4.

3/5 * (2 2/3 : 3 1/5) = 1/2. 

1). 2 2/3 : 3 1/5 = 8/3 : 16/5 = 8/3 * 5/16 = (8 * 5) / (3 * 16) = 40/48 = 10/12 = 5/6; 

2). 3/5 * 5/6 = (3 * 5) / (5 * 6) = 15/30 = 1/2. 

Ответ: 1/2.