Найдите значение числового выражения 5 4/7: 1 5/21-(5 2/15×3/22+1 14/15)

5 4/7 : 1 5/21 - (5 2/15 * 3/22 + 1 14/15) = 1 целая 13/15

1) 5 2/15 * 3/22 = 77/15 * 3/22 = (7*1)/(5*2) = 7/10
2) 7/10 + 1 14/15 = 21/30 + 1 28/30 = 1 49/30 = 2 19/30
3) 5 4/7 : 1 5/21 = 39/7 : 26/21 = 39/7 * 21/26 = (3*3)/(1*2) = 9/2 = 4 1/2
4) 4 1/2 - 2 19/30 = 4 15/30 - 2 19/30 = 3 45/30 - 2 19/30 = 1 26/30 = 1 13/15