Question

tính: (120/123.124/121+127/130).(2019/2020.19/18-21/25.19/18).(42/30.75/23-19/23.210/38

Answer 1

`(120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) . ( 42/30 . 75/23 - 19/23 . 210/38)`

`= (120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) .  ( 105/23 - 105/23)`

` = (120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) . 0`

` = 0`

Answer 2

`(120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) . ( 42/30 . 75/23 - 19/23 . 210/38)`

`= (120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) . ( (42xx75)/(30xx23) - (19xx210)/(23xx38))`

`= (120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) .  ( 105/23 - 105/23)`

` = (120/123 . 124/121 + 127/130) . ( 2019/2020 . 19/18 - 21/25 . 19/18) . 0`

` = 0`