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julipol
@julipol
July 2022
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1)сороковой член арифметической прогрессии а1=38,d=-3
2) сумма первых двадцати членов а1=1, a2=6
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pentV
1)An=A1+(n-1)d=38+(40-1)×(-3)=-79
2)d=A2-A1=6-1=5;
A20=1+19×5=96
S20=(96+1)×10=970
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Answers & Comments
2)d=A2-A1=6-1=5;
A20=1+19×5=96
S20=(96+1)×10=970