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Dvoeshnikgg
@Dvoeshnikgg
August 2022
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Найдите сумму шестнадцати первых членов арифметической прогрессии -8,-4,0.... подробно плз
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kozhaisa
A1=-8 a2=-4 d=a2-a1=4
S 16=((2a1+15d.)*16)/2=(2*(-8)+15*4)*8=44*8=352
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Answers & Comments
S 16=((2a1+15d.)*16)/2=(2*(-8)+15*4)*8=44*8=352