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raxilyashabano
@raxilyashabano
July 2022
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Найдите а1 в арифметической прогрессии, если d=3, S20=670
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zarembo73
d=3, S20=670, а1-?
S20=(2a1+19d)*20/2;
(2a1+19d)*10=670;
2a1+19*3=67;
2a1+57=67;
2a1=67-57;
2a1=10;
a1=5.
Ответ: Е) 5.
7 votes
Thanks 21
raxilyashabano
Спасибо большое!
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Answers & Comments
S20=(2a1+19d)*20/2;
(2a1+19d)*10=670;
2a1+19*3=67;
2a1+57=67;
2a1=67-57;
2a1=10;
a1=5.
Ответ: Е) 5.