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Bluah
@Bluah
July 2022
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Найдите сумму всех натуральных чисел кратных 3 и не превосходящих 100
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Carlsen
Verified answer
Дано: 3,6,9,...,99. a1=3, d=3.
Найти:Sn.
Решение.
an=3+3(n-1)
99=3+3(n-1)
96=3(n-1)
32=n-1
n=33.
Sn=
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Answers & Comments
Verified answer
Дано: 3,6,9,...,99. a1=3, d=3.Найти:Sn.
Решение.
an=3+3(n-1)
99=3+3(n-1)
96=3(n-1)
32=n-1
n=33.
Sn=