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b) `272:16-5+4(30-5-255:17)`

`= 17 - 5 + 4(25-15)`

`= 12 +4.10`

`= 12+40`

`= 52`

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d) `18.3-18.2+3(51:17)`

`= 18.(3-2) + 3.3`

`= 18.1+9`

`= 18+9`

`= 27`

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f) `15.8-(17-30+83)-144:6`

`= 120-70-24`

`= 26`

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h) `13(17-90+83):5 - 18:9`

`= 13.10:5 - 2`

`= 130:5-2`

`= 26-2`

`= 24`

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j) `24(15+30+85-120):10`

`= 24.10:10`

`= 24.(10:10)`

`= 24.1`

`= 24`

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l) `18-4(27-90+73):10`

`= 18-4.10:10`

`= 18- 40:10`

`= 18-4`

`= 14`