Cần gấp giúp với ạ . Hứa vote 5 sao + ctlhn + cảm ơn . 20h mik cần rất rất gấp giúp zới:((

`#2k12`

`7) 5 : (-5/2)^2 + 2/(15) . 3/2 - (-2018)^0 +0,25`

`= 5:(25)/4 + 2/(15) . 3/2 - 1 +1/4`

`= 5 . 4/(25) + 1/5 - 1 +1/4`

`= 4/5 + 1/5 - 1 +1/4`

`= (4/5 + 1/5) - (1-  1/4)`

`= 1 - 3/4 =1/4`

`8) (1,2 - 1/2) : 1 1/(20) + (3/4 - 1,25) - (-3/2)^2`

`= (6/5 -1/2) : (21)/(20) + (3/4 -5/4) - 9/4`

`= 7/(10) : (21)/(20) + (-1/2) -9/4`

`= 2/3 - 1/2 - 9/4`

`= 1/6 - 9/4  = -(25)/(12)`

`9) ((-1)^6 . 3^5 . 4^3)/(9^2 . 2^5)`

`= (1^6 . 3^5 . (2^2)^3)/((3^2)^2 . 2^5)`

`= (1^6 . 3^5 . 2^6)/(3^4 . 2^5)`

`=(1.3.2)/(1.1)`

`= 3.2=6`

`10) 3/5 + 2 1/5 : (-1/2)^3 - 1^{2008}`

`= 3/5 + (11)/5 : (-1/8) - 1`

`= 3/5 + (-(88)/5) -1`

`= 3/5 - (88)/5 -1`

`= -17 - 1 =-18`

`11) 12 + 8 .  (-1/3)^3 + [(2018)^0 : 1/2]^2`

`= 12 + 8 .(-1/(27)) + [1 :1/2]^2`

`= 12 + (-8/(27)) + 2^2`

`= 12 - 8/(27) +4`

`= (316)/(27) + 4 = (424)/(27)`

`12) 2^3 . (1/4)^3 - 6 3/5 - 5/8 + 4 3/5`

`= 8 . (1/(64)) - (33)/5 - 5/8 + (23)/5`

`= 1/8 - (33)/5 - 5/8 + (23)/5`

`= (1/8 - 5/8) - ((33)/5 - (23)/5)`

`= -4/8 - 2`

`= -1/2-2`

`=-5/2`