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a fost răspuns

Calculati,folosind factorul comun.
g) [tex] 12^{n+1} +3^n*4^{n+1}-3^{n+2}*4^n[/tex]
h) [tex]3^{n+3}*4^n+3^{n+1}*4^{n+2}-3^{n+2}*4^{n+1}[/tex]