nomo 8,5,12 ya tolong #BESOKUJIAN

5. a³+b³
-5³+2³= -125+8
=-117
8. √25²-√24²+√49
= √625-√576+7
= √49+7
= 7+7
=14
12. 24²-17²-7
= 576-289-49
=238