#### Answer

$\frac{1}{a^2b^2}$

#### Work Step by Step

$\frac{a}{b^3}\times\frac{b}{a^3}=\frac{a\times b}{b^3\times a^3}=\frac{ab}{a^3b^3}=\frac{ab\div ab}{a^3b^3\div ab}=\frac{1}{a^2b^2}$

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

$\frac{1}{a^2b^2}$

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