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Covacibianca200
a fost răspuns

Calculați sumele:
2+4+6+....98+100
3+6+9+...+180
4+8+12+....+360

Răspuns :

Gicu1973
2+4+6+.....100=100(100+1)/2=100*101/2=5050   3+6+9+...+180=180(180+1)/2=180*181/2=16290    4+8+12+...+360=360(360+1)/2=360*361/2=64980

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