Question 861380
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{{{-4d^(-2)e^(-1)f^3}}}

Consider it to have a denominator of 1:

{{{(-4d^(-2)e^(-1)f^3)/1}}}

To get a factor with a negative exponent positive, move base 
and exponent from the numerator to the denominator, (or vice-versa)
and change the exponent to positive:

We move the d<sup>-2</sup> from numerator to denominator and
change the negative exponent to positive and we have d<sup>2</sup>
in the denominator:

{{{(-4e^(-1)f^3)/(1*d^2)}}}

We move the e<sup>-1</sup> from numerator to denominator and
change the negative exponent to positive and we have e<sup>1</sup>
in the denominator: 

{{{(-4f^3)/(1*d^2e^1)}}}

We can eliminate the 1's, leaving them understood:

{{{(-4f^3)/(d^2e)}}}

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6x³y&#8315;²z²

{{{6x^3y^(-2)z^2}}}

Consider it to have a denominator of 1:

{{{(6x^3y^(-2)z^2)/1}}}

We move the y<sup>-2</sup> from numerator to denominator and
change the negative exponent to positive and we have y<sup>2</sup>
in the denominator:

{{{(6x^3z^2)/(1*y^2)}}}

Eliminate the 1 understood:

{{{(6x^3z^2)/y^2}}}

Edwin</pre>