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ma puteti ajuta cu 9 . nu inteleg genil asta de exercitii . va roog :(

Ma Puteti Ajuta Cu 9 Nu Inteleg Genil Asta De Exercitii Va Roog class=

Răspuns :

[tex]3^n-2/9^n-3^{n+1}+2(?)\\ 9^n-3^{n+1}+2=9^n-3^{n}*3+2=9^{n}-4*3^n+3^n+4-2=\\ =(3^n)^2-4*3^{n}+4+3^{n}-2=(3^n-2)^2+(3^n-2)=\\ (3^n-2)(3^n-2+1)=(3^n-2)(3^n-1) \Rightarrow 3^n-2/9^n-3^{n+1}+2[/tex]