1)
3 1/3 + 6,4-7,5=
3 1/3 -1,1=
10/3 - 11/10 =
10*10/3*10 - 11*3/10*3 =
100/30 - 33/30 =
67/30 =
2 7/30 (2 целых 7/30)
2) 2/11 * (14 1/3 + 2 1/6)=
2/11 * (43/3 + 13/6)=
2/11 * (43*2/3*2 + 13/6)=
2/11 * (86/6 + 13/6)=
2/11 * 99/6 =
2*99/11*6=
198/66=
=3
3)
16,5:2,745 - 1/19 * 57=
165/10 :2745/1000 - 3 =
165/10 * 1000/2745 - 3 =
165*1000/10*2745 -3=
165000/27450 - 3=
Знаменатель и числитель дроби сокращаем на 150:
1100/183 - 3=
6 2/183 - 3=
3 2/183 (три целых 2/183)