Posted by Nora Escobedo on Tuesday, October 11, 2011 at 1:56am.
Learn to add/subtract exponents:
27x^-2y^6/3x^5y^2z^9
= 27/3 * x^(-2-5) y^(6-2) z^(0-9)
= 9 x^-7 y^4 z^-9
= 9y^4/(x^7 z^9)
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