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Antoniablablabla
a fost răspuns

Calc:41+2+4+6+.....+80 dau coroana

Răspuns :

Măroi
aflam suma 2+4+6+.....+80
(80-2):2+1=15
(80+2)×15=82×15=1230
41+2+4+6...+80=1681 e rasp corect...am calc de 3 ori