algebra
posted by ll .
multiply and simplify
z^27z18/z^24z+4*z2/z9

z^27z18 = (z9)(z+2)
z^24z+4 = (z2)(z2)
so,
(z9)(z+2)/(z2)(z2) * (z2)/(z9) = (z+2)/(z2)
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