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sergeviya
@sergeviya
July 2022
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найти суму первых восьми членов арифметичной прогресии (An) , якщо А1 = 2,5 , d = -2.
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karamushevanast
A₁=2,5 d=-2 S₈-?
a₈=2,5+7*(-2)=2,5-14=-11,5
S₈=(2,5+(-11,5))*8/2=-9*4=-36
1 votes
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sangers1959
Verified answer
А8=а1+d(8-1)=2.5-2*7=2,5-14=-11,5
S8=a1+a8/2 *8=2.5-11.5/2 *8=-36
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Answers & Comments
a₈=2,5+7*(-2)=2,5-14=-11,5
S₈=(2,5+(-11,5))*8/2=-9*4=-36
Verified answer
А8=а1+d(8-1)=2.5-2*7=2,5-14=-11,5S8=a1+a8/2 *8=2.5-11.5/2 *8=-36