Question

1. tính:

A) 5/13 . 3/4 + -3/4 . 2/13 -   -3/4 .  -10/13

help me please

Answer 1

`5/13 . 3/4 + (-3)/4 . 2/13 - (-3/4) . (-10/13)`

`=5/13 . 3/4 - 3/4 . 2/13 - 3/4 . 10/13`

`= 3/4 . (5/13 - 2/13 - 10/13)`

`= 3/4 . (-7/13)`

`=-21/52`