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

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

`=5 : 25/4 + 6/30 - 1+1/4`

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

`=20/25+1/5-1+1/4`

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

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

`=0+1/4`

`=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`

`=(12/10-5/10). 20/21+{-2}/4-9/4`

`=7/10 . 20/21 -2/4-9/4`

`=140/210-(2/4+9/4)`

`=2/3-11/4`

`=8/12-33/12`

`={-25}/12`

`···············`

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

`={1.3^5 . 2^6}/{3^4 . 2^5}`

`=3.2`

`=6`

`··············`

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

`=3/5+11/5 : {-1}/8-1`

`=3/5+11/5 . (-8)-5/5`

`=(3/5-5/5)+{-88}/5`

`={-2}/5+{-88}/5`

`={-90}/5`

`=-18`

`················`

`11)12+8 . (-1/3)^3 +[(2008)^0:1/2]^2`

`=12+8 . {-1}/27 + (1:1/2)^2`

`=12 + {-8}/27+2^2`

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

`=16-8/27`

`=432/27-8/27`

`=424/27`

`···············`

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

`=2^3 . 1/{2^6} - (6 3/6-4 3/5)-5/8`

`={2^3}/{2^6}-(6-4)-5/8`

`=1/{2^3}-2-5/8`

`=1/8-2-5/8`

`={-4}/8-16/8`

`={-20}/8`

`={-5}/2`

`#Sal_tSea`