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sw10
@sw10
July 2022
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АРИФМЕТИЧЕСКАЯ ПРОГРЕССИЯ
ЗАДАНА первыми двумя членами a1=8 a2=5 найти сумму первых 20 членов прогрессии.
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sedinalana
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D=a2-a1=5-8=-3
a20=a1+19d=8-57=-49
S20=(a1+a20)*20/2=(8-49)*10=-41*10=-410
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Verified answer
D=a2-a1=5-8=-3a20=a1+19d=8-57=-49
S20=(a1+a20)*20/2=(8-49)*10=-41*10=-410