3) `|-1/6| + 2/3-(1/2)^2`
`=1/6+2/3-1/4`
`=4/24+16/24-6/24`
`=14/24=7/12`
6) `2,7+1/3. (-2,7)+(-2,7)+1/3 .(-0,3)`
`=(2,7 - 2,7) + 1/3 . (-2,7 - 0,3)`
`= 1/3 . (-3)`
`=-1`
9) `(2^4 .3^6)/(6^10) - (2^5 .15^3)/(6^3.10^2)`
`=(2^4 .3^6)/((2.3)^10) - (2^5 . (3.5)^3)/( (2.3)^3 . (2.5)^2)`
`=(2^4 .3^6)/(2^10 .3^10) -(2^5 .3^3 .5^3)/(2^3 .3^3 .2^2 .5^2)`
`=1/(2^6. 3^4) - (2^5 .3^3 .5^3)/(2^5 .3^3 .5^2)`
`=1/5184 - 5`
`=-25919/5184`
