(2-1 целая 7/12)(3/8-1/6)3целых 1/4

3)) 2- 1 7/12 : 3/8 - 1/6 3 1/4=
6 1/2= 6,5.


1)) 2- 1 7/12= 1 12/12- 1 7/12= 5/12

2)) 3/8- 1/6= (33)/(83)- (14)/(64)=

9/24 - 4/24= 5/24

3)) 5/12: 5/24 3 1/4=

5/12 24/5 (34+1)/4=

уменьшаем 5 и 5 на 5; 12 и 24 на 12

1/1 2/1 13/4=

уменьшаем 2 и 4 на 2

1/1 1/1 13/2= 13/2= 6 1/2= 6,5.





4)) 7/10 - 2/5 1/4+ 5/6 : 6 1/2=

1/20= 0,05


1)) 7/10- 2/5= 7/10- (22)/(52)=

7/10- 4/10= 3/10

2)) 1/4+ 5/6= (13)/(43)+ (52)/(62)=

3/12+ 10/12= 13/12

3)) 3/10 13/12 : 6 1/2=

уменьшаем 3 и 12 на 3

1/10 13/4: (62+1)/2=

1/10 13/4: 13/2=

1/10 13/4 2/13=

уменьшаем 13 и 13 на 13; 4 и 2 на 2

1/10 1/2 1/1= 1/20= 0,05.

(2-17/12) /(3/8 -1/6) *31/4 =61/2
1)2 -1 7/12 = 1 12/12 -1 7/12 =5/12
2)3/8 - 1/6 = 9-4/24 = 5/24
3)5/12 /5/24 = 5/12 * 24/5 = 2
4) 3 1/4 * 2 = 6 2/4 = 6 1/2