Ответы на вопрос:
S6 = (a1 + a6)·6/2 = (а1 + а1 + 5d)·3 = (2a1 +5d)·3 d=-1 1/3 - (-3 2/3) = -1 1/3 + 3 2/3 = 2 1/3 = 7/3 s6 = (2·(-3 2/3) + 5·7/3)·3 =(-22/3 + 35/3)·3 = 13/3·3 = 13
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