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2+4+6+.......+230=cu cat

Răspuns :

2+4+6+....+226  + 228 +230
s= 230+228+226+...+6+4+2
s= 232+232+232+...+232+232+232 ( acolada jos)
2xs=230:2=115
2xs=232x115
2xs= 26680
s= 26680:2
s= 13340
sper ca team ajutat nici eu nu le intelegeam dar dupa un timp leam inteles coroana?