Question

Answer 1

`1/4 . 7/3 . 12`

`= ( 1. 7.12)/(4.3)`

`= (1.7.4.3)/(4.3)`

`=1.7`

`=7`

`------`

`3/8 . 56 . 25/7 .(-4)`

`= ( 3.56.25)/(8.7) .(-4)`

`=(3.7.8.25)/(8.7)  .(-4)`

`= 3.25.(-4)`

`=3 . (-100)`

`=-300`

`--------`

`3/7 . 2/5 . 7/3 . 20 . 19/72`

`= ( 3/7 . 7/3 ) . 2/5 . 20 . 19/72`

`= 1 .2/5 . 20 . 19/72`

`= 2/5  . 20 . 19/72`

`=19/9`

`-----`

`6/7 . 8/13 + 6/13 . 9/7 - 3/13 .6/7`

`= 6/7 . ( 8/13 -3/13) + 6/13 . 9/7`

`= 6/7 . 5/13 + 6/13 . 9/7`

`= 30/91 + 54/91`

`= 84/91`

`=12/13`