giúp e với ạ e đánh 5 + tim+hay nhất ạ

`a) 2,4 . 2/9 - 9/10`

`= 12/5 . 2/9 -9/10`

`= 8/15 - 9/10`

`= 16/30 - 27/30`

`= -11/30`

`b) (-0,1). 36+ 11/(-35)`

`= (-3,6)- 11/35`

`= (-18)/5 - 11/35`

`= (-126)/35 - 11/35`

`=(-137)/35`

`c) 0,12 . 3(4)/7 - 35/8 . 4/(-49)`

`= 3/25 . 25/7 - 35/8 . (-4)/49`

`= 3/7 + 5/14`

`= 6/14 + 5/14`

`= 11/14`

`d) 0,64 : 2/15 +7/(-3) : 3(1)/2`

`= 16/25 . 15/2 - 7/3 : 7/2`

`= 24/5 - 7/3 . 2/7`

`= 24/5 - 2/3`

`= 72/15 - 10/15`

`= 62/15`