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yulyarashidova1
@yulyarashidova1
August 2022
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Найдите сумму первых тринадцати членов арифметической прогрессии -8; -5; -2; …
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sedinalana
Verified answer
A1=-8,a2=-5
d=a2-a1=-5+8=3
a13=a1+12d=-8+36=28
S13=(a1+a13)*13/2=(-5+28)*13/2=23*13/2=149,5
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Verified answer
A1=-8,a2=-5d=a2-a1=-5+8=3
a13=a1+12d=-8+36=28
S13=(a1+a13)*13/2=(-5+28)*13/2=23*13/2=149,5