<PRE><B>Question 466733</B>
a^-2 b^0 c^-1
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a^-1 c^3

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= (a^-2/a^-1)(b^0)(c^-1/c^3)
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= (1/a)(1)(1/c^4)
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= 1/[a*c^4]
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Cheers,
Stan H.</PRE>