Вычислите 4 2/5 / ( 1 1/2 - 2/5 ) + (3/4 + 5/6 ) / 4 3/4

         3          1        5        2          4

4 2/5 : (1 1/2 - 2/5) + (3/4 + 5/6) : 4 3/4 = 5.

1) 1 1/2 - 2/5 = 3/2 - 2/5 = 15/10 - 4/10 = 11/10;

2) 3/4 + 5/6 = 9/12 + 10/12 = 21/12;

3) 4 2/5 : 11/10 = 22/5 : 11/10 = 22/5 * 10/11 = 4;

4) 21/12 : 4 3/4 = 21/12 : 19/4 = 21/12 * 4/19 = 21/57 = 7/19;

5) 4 + 7/19 = 76/19 + 7/19 = 95/19 = 5.