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xom9ik1
@xom9ik1
July 2022
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Легкая задача с арифметической прогрессией. Номер 3
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Pacanka202
А6=–6,1; d=0,7
a6=a1+5d
a1=a6–5d=–6,1–3,5=–9,6
S6=(2a1+5d)2 *6 =(–19,2+3,5)/2 *6 =
= –47,1
an=a1+d(n–1)= –9,6+0,7n–0,7=0,7n–10,3
0,7n–10,3=5,1
0,7n=15,4
n=22
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Answers & Comments
a6=a1+5d
a1=a6–5d=–6,1–3,5=–9,6
S6=(2a1+5d)2 *6 =(–19,2+3,5)/2 *6 =
= –47,1
an=a1+d(n–1)= –9,6+0,7n–0,7=0,7n–10,3
0,7n–10,3=5,1
0,7n=15,4
n=22