a8 = 4*8 - 2 = 32 - 2 = 30
a9 = 4*9 - 2 = 36 - 2 = 34
30 + 34 = 64
an=4n-2
Найти (а₉ + а₈).
а₈ = 4*8-2 = 30
а₉ = 4*9-2 = 34
а₉+а₈ = 34 + 30 = 64
Ответ: 64.
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Verified answer
a8 = 4*8 - 2 = 32 - 2 = 30
a9 = 4*9 - 2 = 36 - 2 = 34
30 + 34 = 64
Verified answer
an=4n-2
Найти (а₉ + а₈).
а₈ = 4*8-2 = 30
а₉ = 4*9-2 = 34
а₉+а₈ = 34 + 30 = 64
Ответ: 64.