#### Answer

$-1\frac{17}{28}$

#### Work Step by Step

$(\frac{1}{2}\times\frac{2}{7})-(\frac{1}{2}\div\frac{2}{7})$
$=(\frac{1}{1}\times\frac{1}{7})-(\frac{1}{2}\times\frac{7}{2})$
$=\frac{1}{7}-\frac{7}{4}$
$=\frac{4}{28}-\frac{49}{28}$
$=-\frac{45}{28}$
$=-1\frac{17}{28}$