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8915nika
@8915nika
July 2022
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Помогите решить!!!!!!!!!!!!!
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momogahari
Объяснение:
Sn=(A1+An)/2 *n
An=A1+(n-1)*d
1 votes
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Answers & Comments
Объяснение:
Sn=(A1+An)/2 *n
An=A1+(n-1)*d