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NIKOLINA21
@NIKOLINA21
July 2022
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Последовательность (a_n) - арифметическая прогрессия , a_20=153, d=6. Найти а_1.
1) 33; 2) 273; 3) 267; 4) 39.
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ssshhh3
Verified answer
An=a1+(n-1)d
153=a1+(20-1)*6
153=a1+19*6
153=a1+114
a1=153-114
a1=39
Правильный ответ 4) 39
9 votes
Thanks 21
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Verified answer
An=a1+(n-1)d153=a1+(20-1)*6
153=a1+19*6
153=a1+114
a1=153-114
a1=39
Правильный ответ 4) 39