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Ляля365722
@Ляля365722
July 2022
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Найдите седьмой член и сумму четырнадцати первых членов арифметической прогрессии 2; 6;….
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Lesben
D= a2-a1=6-2, d=4
a7=a1+6d,a7=2+6.4, a7=2+24,a7=26
a14=a1+13d,a14=2+13.4 = 2+52,a14=54
s14=14/2.(a1+a14)=7.(2+54)=7.56, s14=392
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Answers & Comments
a7=a1+6d,a7=2+6.4, a7=2+24,a7=26
a14=a1+13d,a14=2+13.4 = 2+52,a14=54
s14=14/2.(a1+a14)=7.(2+54)=7.56, s14=392