Tính:
$a) \sqrt[3]{\sqrt[3]{9}}.\sqrt[9]{3^7}$                                        $b) \frac{\sqrt[3]{7}.\sqrt[4]{343}}{\sqrt[12]{7}} $
$c)  (\frac{1}{16})^{-0,75} +(\frac{1}{8})^{-\frac{4}{3} } $                         $d)  (0,44)^{-1,5}-(0,125)^{-\frac{2}{3} }$
a) $ \sqrt[3]{\sqrt[3]{9}}.\sqrt[9]{3^7}=\sqrt[9]{9}. \sqrt[9]{3^7}=\sqrt[9]{9.3^7}=\sqrt[9]{3^9}=3.$

b)  $ \frac{\sqrt[3]{7}.\sqrt[4]{343}}{\sqrt[12]{7}}=\frac{\sqrt[3]{7}.\sqrt[4]{7^3}}{\sqrt[12]{7} }=\frac{\sqrt[12]{7^4}.\sqrt[12]{7^9}}{\sqrt[12]{7} }=\frac{\sqrt[12]{7^{13}} }{\sqrt[12]{7} }=\sqrt[12]{7^{12}}=7.$

c)   $(\frac{1}{16} )^{-0,75}+(\frac{1}{8} )^{-\frac{4}{3} }=(2^{-4})^{-\frac{3}{4}}+(2^{-3})^{-\frac{4}{3} }=2^3+2^4=8+16=24. $

d)  $ (0,04)^{-1,5}-(0,125)^{-\frac{2}{3} }=(0,2^2)^{-\frac{3}{2}}-(0,5^3)^{-\frac{2}{3} }$$=(0,2)^{-3}-(0,5)^{-2}=125-4=121 $.

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