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2)
![( sqrt[6]{9} )^{-3}= ( sqrt[6]{3^2} )^{-3}= ( sqrt[3]{3} )^{-3}= 3^{-1} = frac{1}{3} ( sqrt[6]{9} )^{-3}= ( sqrt[6]{3^2} )^{-3}= ( sqrt[3]{3} )^{-3}= 3^{-1} = frac{1}{3}](https://tex.z-dn.net/?f=+%28+sqrt%5B6%5D%7B9%7D+%29%5E%7B-3%7D%3D++%28+sqrt%5B6%5D%7B3%5E2%7D+%29%5E%7B-3%7D%3D++%28+sqrt%5B3%5D%7B3%7D+%29%5E%7B-3%7D%3D++3%5E%7B-1%7D+%3D+frac%7B1%7D%7B3%7D)
4)
![( sqrt[8]{16} )^{-4}= ( sqrt[8]{2^4} )^{-4}= ( sqrt{2}) ^{-4} = 2^{-2}= frac{1}{4} ( sqrt[8]{16} )^{-4}= ( sqrt[8]{2^4} )^{-4}= ( sqrt{2}) ^{-4} = 2^{-2}= frac{1}{4}](https://tex.z-dn.net/?f=++%28+sqrt%5B8%5D%7B16%7D+%29%5E%7B-4%7D%3D++%28+sqrt%5B8%5D%7B2%5E4%7D+%29%5E%7B-4%7D%3D++%28+sqrt%7B2%7D%29+%5E%7B-4%7D+%3D+2%5E%7B-2%7D%3D+frac%7B1%7D%7B4%7D+)
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