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muminov453
@muminov453
July 2022
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найдите аn и Sn. если : а) а1=7,d=4.n=30
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ShirokovP
Verified answer
A30 = a1 + 29d = 7 + 29*4 = 123
S30 = (a1 + a30)/2*30 = 15*(7 + 123) = 1950
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Verified answer
A30 = a1 + 29d = 7 + 29*4 = 123S30 = (a1 + a30)/2*30 = 15*(7 + 123) = 1950