Вычислите: 3/8*3*1/9-2*1/2/3*3/4+5*1/3

3/8 * 3 * 1/9 - 2 * 1/2 * 3 * 3/4 + 5 * 1/3 = -11/24. 

1) 3/8 * 3 = (3 * 3)/8 = 9/8 = 1 1/8; 

2). 1 1/8 * 1/9 = 9/8 * 1/9 = (9 * 1) / (8 * 9) = 9/72 = 1/8; 

3). 2 * 1/2 = (2 * 1) / 2 = 2/2 = 1; 

4). 1 * 3 = 3; 

5). 3 * 3/4 = (3 * 3) / 4 = 9/4 = 2 1/4; 

6). 5 * 1/3 = (5 * 1) / 3 = 5/3 = 1 2/3; 

7). 1/8 - 2 1/4 = 1/8 - 9/4 = 1/8 - (9 * 2) / (4 * 2) = 1/8 - 18/8 = -17/8; 

8). -17/8 + 1 2/3 = -17/8 + 5/3 = (- 3 * 17) / (8 * 3) + (5 * 8) / (3 * 8) = -51/24 + 40/24 = (-51 + 40) / 24 = -11/24.