$$\frac { 1 } { 2 } \frac { 1 } { 2 } ( \frac { 1 } { 2 } - 1 \frac { 1 } { 5 } )$$
$-\frac{7}{40}=-0.175$
$$\frac{1\times 1}{2\times 2}\left(\frac{1}{2}-\frac{1\times 5+1}{5}\right)$$
$$\frac{1}{4}\left(\frac{1}{2}-\frac{1\times 5+1}{5}\right)$$
$$\frac{1}{4}\left(\frac{1}{2}-\frac{5+1}{5}\right)$$
$$\frac{1}{4}\left(\frac{1}{2}-\frac{6}{5}\right)$$
$$\frac{1}{4}\left(\frac{5}{10}-\frac{12}{10}\right)$$
$$\frac{1}{4}\times \frac{5-12}{10}$$
$$\frac{1}{4}\left(-\frac{7}{10}\right)$$
$$\frac{1\left(-7\right)}{4\times 10}$$
$$\frac{-7}{40}$$
$$-\frac{7}{40}$$
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$-\frac{7}{40} = -0.175$
