Вот, смотри
эта тема легкая
<u>7^(n+1) * 2^(3n-4) </u>=<u> 7^(n+1) * 2^(3n-4) </u>=<u>7^(n+1) * 2^(3n-4)</u> =
56^(n-1) (7*8)^(n-1) 7^(n-1) * 8^(n-1)
= <u>7^(n+1) * 2^(3n-4)</u> =7^(n+1-(n-1)) * 2^(3n-4-3(n-1)) =
7^(n-1) * 2^(3(n-1))
=7^(n-n+1+1) * 2^(3n-4-3n+3) =7² * 2 ⁻¹=<u>49 </u>= 24.5
2
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