Выполните действие (1/3 - 5/16) : (1/6 - 1/8) и (5/7 - 2/3) : (4/9-5/12)

1.( 1/3-5/16 ) : ( 1/6-1/8 )  = 1/2
       1         3        2
1) 1/3 - 5/16 = 16/48 - 15/48 = 1/48
2) 1/6 -1/8 = 4/24 - 3/24 = 1/24
3) 1/48 : 1/24 = 1/48 * 24/1 = 1/2
2. (5/7-2/3)%(4/9-5/12)=
1)5/7-2/3=1/21
2)4/9-5/12=1/3
3)1/21%1/36=12/7