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2013-12-18T09:55:23+02:00
A1+a2+a3+....+a90=573x90=51570
a91+a92+...+a100=243x10=2430
(a1+a2+a3+.....+a100):100=(51570+2430):100=540 
p.s. mai verifica odata calculele
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