第15页

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$\frac{5}{9}\div15\times\frac{18}{5}$
$=\frac{5}{9}\times\frac{1}{15}\times\frac{18}{5}$
$=\frac{5\times1\times18}{9\times15\times5}$
$=\frac{2}{15}$
$[1 - (\frac{1}{4} + \frac{3}{8})]\div\frac{1}{4}$
$=[1 - (\frac{2}{8} + \frac{3}{8})]\div\frac{1}{4}$
$=(1 - \frac{5}{8})\div\frac{1}{4}$
$=\frac{3}{8}\div\frac{1}{4}$
$=\frac{3}{8}\times4$
$=\frac{3}{2}$