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Yoursun02
@Yoursun02
September 2021
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Дана арифметическая прогрессия: -4, -1,2 ..... Найдите сумму первых шести её членов С объяснениями прошу, прям подробными
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sia87
An=a1+d(n-1)
Sn=a1+an*n/2
a1=-4
d=3
a6=-4+3(6-1)
a6=11
S6=-4+11/2*6=3,5*6=21
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Answers & Comments
Sn=a1+an*n/2
a1=-4
d=3
a6=-4+3(6-1)
a6=11
S6=-4+11/2*6=3,5*6=21