`3) 6.9.24 + 21.32 + 3.55`
`= (6.55).(9.3).(24.32)+21`
`= 330.27.768+21`
`= 6842880+21`
`= 6842901`
`5) 79.114 – 28.79 + 79.14 + 33`
`= 79.(114-28).(14+33)`
`=79.86.47`
`= 319318`
`8)80 – (4.5² – 3.2') : 38`
`= 80 - (4.25-3.8):38`
`= 80 - (100-24):38`
`= (80 - 76):38`
`= 38:4`
`= 9,5`
`11)(153.53 – 99.53 – 53²) : 53 + 1^0`
`= 153.(53-53)-(53.53²):99+1^0`
`= (153-53).(2809:99)+1`
`=(100.28,3)+1`
`= 2830+1`
`=2831`