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pandaaa25
@pandaaa25
July 2022
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Восьмой член арифметической прогрессии ,состоящей из 15
членов равен 18. Чему равна сумма всех членов этой прогрессии ?
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sedinalana
Verified answer
A8=a1+7d=15
S15=(2a1+14d)*15/2=2(a1+7d)*15/2=15*15=225
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Verified answer
A8=a1+7d=15S15=(2a1+14d)*15/2=2(a1+7d)*15/2=15*15=225