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dadashov68
@dadashov68
July 2022
2
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Помогите пожалуйста, очень прошу!!
Дана арифметическая прогрессия: 1/2, 2, 7/2... Найдите сумму первых шести ее членов?
Желательно на листочке))
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zahargm808
S_{n}= \frac{n(a_{1}+ a_{n})}{2}
S_{6}= \frac{6(0.5+8)}{2}
S_{6}=51/2=20.5
0 votes
Thanks 1
zahargm808
спасибо, админы
Lesben
51/2=25,5
Lesben
D= a2-a1=a3-a2=a4-a3=.........
d=2 - 1/2 = 3/2
sn= n/2(a1+an)
an=a1 + (n-1)d
a6=a1+5.d,a6=1/2+5.3/2 = 1/2+15/2 = 16/2=8,a6=8
s6=6/2.(1/2+8)=3.(8,5)=25,5
s6=25,5
1 votes
Thanks 1
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Answers & Comments
S_{6}= \frac{6(0.5+8)}{2}
S_{6}=51/2=20.5
d=2 - 1/2 = 3/2
sn= n/2(a1+an)
an=a1 + (n-1)d
a6=a1+5.d,a6=1/2+5.3/2 = 1/2+15/2 = 16/2=8,a6=8
s6=6/2.(1/2+8)=3.(8,5)=25,5
s6=25,5