Выполните деление 3/7: 1/2 б) 1 2/5: 2 3/5

3/7 : 1/2 = 3/7 * 2/1 = 6/7
1 2/5 : 2 3/5 = 7/5 : 13/5 = 7/5 * 5/13 = 7/13

3/7х = 5
х = 5 : 3/7 = 5 * 7/3 = 35/3 = 11 2/3
х = 11 2/3

(3/8 + (1/2^2) + 1 1/4  ) : 5/3 = 1 1/8  
1) 1/2 * 1/2 = 1/4
2) 3/8 + 1/4 = 3/8 + 2/8 = 5/8
3) 5/8 + 1 1/4 = 5/8 + 1 2/8 = 1 7/8
4) 1 7/8 : 5/3  = 15/8 * 3/5 = (3*3)/(8*1) = 9/8 = 1 1/8