Найдите значение выражения: 1) 3 3/4 : 3/8 : 1 3/7;

1) 3 3/4 : 3/8 : 1 3/7=15/4 * 8/3 * 7/10=5/1 * 2/1 * 7/10=10/1 * 7/10=7;
2) 3 3/4 : (3/8 : 1 3/7)=15/4 : (3/8 * 7/10)=15/4 : 21/80=15/4 * 80/21=5/1 * 20/7=100/7;
3) 1 7/9 * 15/32 : 1 19/36=16/9 * 15/32 * 36/55=1/1 * 3/1 * 2/11=6/11;
4) 1 7/9 * (15/32 : 1 19/36)=16/9 * (15/32 * 36/55)=16/9 * (3/8 * 9/11)=16/9 * 27/88=
2/1 * 3/11=6/11;
5) 3 4/7 : 1 1/7 * 2/3=25/7 * 7/8 * 2/3=25/1 * 1/4 * 1/3=25/12;
6) 3 4/7 : (1 1/7 * 2/3)=25/7 : (8/7 * 2/3)=25/7 * 21/16=25/1 * 3/16=75/16=4 11/16;
7) (5/12 + 1/8) : 3/8= (10+3)/24 * 8/3=13/24 * 8/3=13/3 * 1/3=13/9=1 4/9;
8) 5/12 + 1/8 : 3/8=5/12 + 1/8 * 8/3=5/12 + 1/3=(5+4)/12=9/12=3/4;
9) 2 6/7 : (5/6 - 9/14)=2 6/7 : (5/6 - 9/14)=20/7 : (35-27)/42=20/7 * 8/42=20/7 * 21/4=
5/1 * 3/1=15/1=15;
10) 2 6/7 : 5/6 - 9/14=20/7 * 6/5 - 9/14=4/7 * 6/1 - 9/14=24/7 - 9/14=(24*2-9)/14=
(48-9)/14=39/14=2 11/14;
11) 2 1/4 : 1 4/11 - 3/8 : 7/8=9/4 * 11/15 - 3/8 * 8/7=3/4 * 11/5 - 3/1 * 1/7=33/20-3/7=
(33*7-3*20)/140=(231-60)/140=171/140=1 31/140;
12) (3 1/6 - 5 1/6 : 4 2/15) * 3/92=(19/6 - 31/6 * 15/62) * 3/92=(19/6 - 1/2 * 5/2) * 3/92=
(19/6 - 5/4) * 3/92=((19*2-5*3)/12) * 3/92=((38-15)/12) * 3/92=23/12 * 3/92=
1/4 * 1/4=1/16