[tex]\frac{5^{n+1}-5^{n-1}}{5^{n}\cdot2} [/tex]. Created by HippoGrives. algebra-ru

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русская25 $\frac{5^{n+1}-5^{n-1}}{5^n*2}= \frac{5^{n-1}(5^{n+1-(n-1)}-1)}{5^n*2}= \frac{5^{n-1}(5^2-1)}{5^n*2}= \frac{5^n*5^{-1}(25-1)}{5^n*2}=\\\\= \frac{24}{5*2}= \frac{24}{10}=2,4$

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Во вложении.................)

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русская25 у вас неверный ответ.

русская25 извините,ошиблась,у вас верный ответ.

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