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

Question

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

Answer 1

3) (1/3-5/16)÷(1/6-1/8)=
=(16/48- 15/48)÷(4/24-3/24)=
=1/48÷1/24=1/48×24/1=1/2;

4)(5/7-2/3)÷(4/9-5/12)=
=(15/21-14/21)÷(16/36-15/36)=
=1/21÷1/36=1/21×36/1=
=12/7=1 5/7.