cbrt(54)-cbrt(128).
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document.write( "Try to express each as the factor of a perfect cube and some other number. Then you can remove the perfect cube from the cube root by taking its cube root.
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document.write( "cbrt(2*27) - cbrt (2*64) = 3cbrt(2) - 4cbrt(2) = -cbrt(2).\r
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