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mariomshina
@mariomshina
July 2022
2
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Помогите с арифметическими прогрессиями!
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m11m
6.
А₆=А₄+2d=-16+2*(-2)=-16-4=-20
Ответ: -20.
7.
А₆=А₁+5d
15=A₁+5*1
A₁=10
A₁₅=A₁+14d=10+14*1=24
S₁₅=
(A₁+A₁₅)*15
=7.5(10+24)=7.5*34=255
2
Ответ: 255
1 votes
Thanks 1
kukinastya
А у меня так получилось
0 votes
Thanks 0
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Answers & Comments
А₆=А₄+2d=-16+2*(-2)=-16-4=-20
Ответ: -20.
7.
А₆=А₁+5d
15=A₁+5*1
A₁=10
A₁₅=A₁+14d=10+14*1=24
S₁₅=(A₁+A₁₅)*15=7.5(10+24)=7.5*34=255
2
Ответ: 255