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EX 8DIN COMPEDIU CLASA 5
DETERMINATI VALOAREA SUMEI:23+24+25+.....+85


Răspuns :

S=23+24+25+...+85
S=(1+2+3+...+62)–23
S=62×63 supra 2 –23
S=31×63–23
S=1953–23
S=1930