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calculati:
1+2+3+...+289
10+20+30+...+530
7+14+21+....+175
13+26+39+....+676
folosind suma gauss

REPEDE DAU COROANA SI 50 PUNCTE​


Răspuns :

Răspuns:

Explicație pas cu pas:

1+2+3+...+289=289×290/2=289×145=41 905

10+20+30+...+530=10(1+2+3+....+53)=10×53×54/2==14 310

7+14+21+....+175=7(1+2+3+......+25)=7×25×26/2=2 275

13+26+39+....+676=13(1+2+3+.....+52)=13×52×53/2=13×26×53=17 914‬