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violettachka
@violettachka
July 2022
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найти a1 и d арифметической прогрессии если a7-a1=30 a2+a10=54
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jakovleva01
А7-а1=30=а1+6d-а1=6d
d=5
a2+a10=54=a1+d+a1+9d=2a1+10d=2a1+50
2a1=4
a1=2
Ответ: d=5, а1=2
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Answers & Comments
d=5
a2+a10=54=a1+d+a1+9d=2a1+10d=2a1+50
2a1=4
a1=2
Ответ: d=5, а1=2