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9+18+27+…..+738 RAPID

Răspuns :

Răspuns:

9+18+27+…..+738=

9(1+2+3+...+82)=

9·[(82·(82+1)/2]=

9·3403=

30627

Răspuns:

9+18+27+....+738

9×1+9×2+9×3+....+9×82

9×(1+2+3+.....+82)

9×[(1+82)×82]:2

9×(83×82):2

9×6806:2

61254:2

30627