Question 210151
Basically you can rewrite this as {{{(r*r)/(2*r*r*r)}}}
because there are not any addition or subtraction signs, you can reduce items in the numerator with items in the denominator {{{(numerator)/(denominaotor)}}}
therefore, you are left with {{{1/(2r)}}}


*note{{{(r+r)/(2*r*r*r)}}} would give you a different answer.

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