[tex]Zad. 18\\\\3^{\frac83}*\sqrt[3]{9^2}=3^{\frac83}*9^{\frac23}=3^{\frac83}*(3^2)^{\frac23}=3^{\frac83}*3^{\frac43}=3^{\frac83+\frac43}=3^{\frac{12}3}=3^4\\\\Odp. C\\\\Zad. 19\\\\\sqrt[3]3*\sqrt[6]3=3^{\frac13}*3^{\frac16}=3^{\frac26+\frac16}=3^{\frac36}=3^{\frac12}=\sqrt3\\\\Odp. D[/tex]
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Korzystamy z ponizszych wzorow:
[tex]\sqrt[m]{a^n}=a^{\frac{n}m}\\a^n*a^m=a^{n+m}[/tex]
