Найдите an и Sn, ecли:(2 и 4). Created by yogurtDanone. algebra-ru

Найдите an и Sn, ecли:(2 и 4)...

Darknessich

Ответ:

решение на фотографии

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manyny06

Verified answer

Ответ:

$2) S_n = 2220\\\\4) S_n = 1229,3$

Объяснение:

$a_n = a_1 + d(n-1)\\\\S_n = \frac{a_1+a_n}{2}\cdot n = \frac{a_1+a_1+d(n-1)}{2}\cdot n = \frac{2a_1+d(n-1)}{2}\cdot n\\\\2)\ S_n = \frac{2\cdot12+ 7(24-1) }{2}\cdot24=(8\cdot24-7)\cdot12=2220\\\\4) S_n = \frac{2\cdot(-7,3)+ 8(19-1) }{2}\cdot19=(-7,3+4\cdot 18)\cdot19=1229,3$

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