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Den96p
@Den96p
July 2022
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Дана арифметическая прогрессия {an}. Вычислите сумму 7 членов, если а11=12, d=1
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miron2077
Verified answer
А₁₁=а₁+(11-1)1
12=а₁+10
а₁=2
а₇=а₁+(7-1)1
а₇=2+6=8
S₇=
7(a₁+a₇)
=(7*10) /2=35
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Answers & Comments
Verified answer
А₁₁=а₁+(11-1)112=а₁+10
а₁=2
а₇=а₁+(7-1)1
а₇=2+6=8
S₇=7(a₁+a₇) =(7*10) /2=35
2