The expression is .
(Write prime factorization of 64)
(Definition of negative exponent)
The solution is .
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(Write prime factorization of 64)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8286858c77a10931dd615939e0ae31e1.png\")
(Definition of negative exponent)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.