Răspuns:
1.624x32=19968
7×(9+8)=7×17=119 restu nu inteleg
2.a) 32x170+26+109=5440+135=5575
b) (19+26+0+38)×145=83×145=12035
3. a) 3×(87×514)=3×44718=134154
b) 52×51×63=167076
486+894=1380
167076-1380=165696
c) 888×518=459984
888+518=1406
459984-1406=458578