The expression is .
(Write prime factorization of 19)
(Definition of negative exponent)
The solution is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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(Write prime factorization of 19)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8352ba347b4f17bd0c85042f598d35c3.png\")
(Definition of negative exponent)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.