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Isabell5400
@Isabell5400
August 2021
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Найдите d и а10 арифметическая прогрессия.
2;7;12;17.....
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Danil12584
D=a2-a1
a1=2
a2=7
d=7-2=5
an=a1+(n-1)d
a10=2+(10-1)•5
a10=2+9•5
a10=2+45
a10=47
Ответ:d=5;a10=47
2 votes
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Answers & Comments
a1=2
a2=7
d=7-2=5
an=a1+(n-1)d
a10=2+(10-1)•5
a10=2+9•5
a10=2+45
a10=47
Ответ:d=5;a10=47