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MERRY191
@MERRY191
July 2022
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В арифметической погрессии (cn)известно,что c2=-2 и d=3.Найдите сумму её меми первых членов.
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DOandDO
С1=С2-d= -5
Sn=(2c1+d(n-1))*0.5n=
S7=(-10+3*6)*3.5=28
Ответ: 28
0 votes
Thanks 1
Ranbu
C2=c1+d=-2
c1+3=-2
c1=-5
S7=
=
=28
1 votes
Thanks 1
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Answers & Comments
Sn=(2c1+d(n-1))*0.5n=
S7=(-10+3*6)*3.5=28
Ответ: 28
c1+3=-2
c1=-5
S7===28