Ответ:
1) a(8)= 2×64-1
so
a(8)=127
2)
a(1)+a(3)=a(2)+a(2)
so a(2)=5 d=3
a(9)=a(2)+7d
a(9)=5+21=26
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Ответ:
1) a(8)= 2×64-1
so
a(8)=127
2)
a(1)+a(3)=a(2)+a(2)
so a(2)=5 d=3
a(9)=a(2)+7d
a(9)=5+21=26