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nyrik99
@nyrik99
July 2022
1
8
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Найдите сумму первых восьми членов арифметической прогрессии:
а) -23; -20; ...
б) 14.2; 9.6; ...
Срочно нужно, помогите пожалуйста!!!
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Answers & Comments
Lizavil3
S8=(a1+a8)8/2
a8=a1+7d
d=-20+23=3
a8=-23+3*7=-2
S8=(-23+(-2))8/2=-100
б)d=9,6-14,2=-4,6
а8=14,2-4.6*7=-17,6
S8=(14,2-17,6)8/2=-13,6
5 votes
Thanks 14
nyrik99
Спасибо!
Lizavil3
Всегда пожалуйста!
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Answers & Comments
a8=a1+7d
d=-20+23=3
a8=-23+3*7=-2
S8=(-23+(-2))8/2=-100
б)d=9,6-14,2=-4,6
а8=14,2-4.6*7=-17,6
S8=(14,2-17,6)8/2=-13,6