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Calculati : 5 la puterea 20x5-5 la puerea 21 !! Rezolvarea pls!!

Răspuns :

[tex]5^{20}\cdot5-5^{21}=5^{21}-5^{21}=0[/tex]

Obs. Am folosit formula :[tex]a^n\cdot a^m=a^{n+m}[/tex].