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369215487
@369215487
March 2022
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Ребяяят помогите)
Если первый член арифметической прогресии равен 7.а восьмой член равен (-7),то найдите сумму первых двадцати членов арифметической прогрессии.
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kaif2100
A8=a1+7d =>d=-2, S20=(2a1+19d)/2 *n=(7*2-19*2)/2 *20=(14-38)*10=-240
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