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hjjkkjkj
@hjjkkjkj
July 2022
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Задание на фото!!!! Помогите.
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ТатМих
Verified answer
А3+а7+а14+а18=10
а1
+2d+
a1
+6d+
a1
+13d+
a1
+17d=10
4a1+38d=10
2a1+19d=5
а20=а1+19d
S20=(a1+a20)*20/2=(a1+a20)*10=(a1+a1+19d)*10=
(2a1+19d)
*10=5*10=50
Ответ:50.
6 votes
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Answers & Comments
Verified answer
А3+а7+а14+а18=10а1+2d+a1+6d+a1+13d+a1+17d=10
4a1+38d=10
2a1+19d=5
а20=а1+19d
S20=(a1+a20)*20/2=(a1+a20)*10=(a1+a1+19d)*10=(2a1+19d)*10=5*10=50
Ответ:50.