$$[\frac{-5}{10}+\frac{10}{20}]+\frac{15}{30}\cdot\frac{-5}{10}+[\frac{10}{20}\cdot\frac{16}{310}]$$
$-\frac{139}{620}\approx -0.224193548$
$$-\frac{1}{2}+\frac{10}{20}+\frac{15}{30}\times \frac{-5}{10}+\frac{10}{20}\times \frac{16}{310}$$
$$-\frac{1}{2}+\frac{1}{2}+\frac{15}{30}\times \frac{-5}{10}+\frac{10}{20}\times \frac{16}{310}$$
$$\frac{15}{30}\times \frac{-5}{10}+\frac{10}{20}\times \frac{16}{310}$$
$$\frac{1}{2}\times \frac{-5}{10}+\frac{10}{20}\times \frac{16}{310}$$
$$\frac{1}{2}\left(-\frac{1}{2}\right)+\frac{10}{20}\times \frac{16}{310}$$
$$\frac{1\left(-1\right)}{2\times 2}+\frac{10}{20}\times \frac{16}{310}$$
$$\frac{-1}{4}+\frac{10}{20}\times \frac{16}{310}$$
$$-\frac{1}{4}+\frac{10}{20}\times \frac{16}{310}$$
$$-\frac{1}{4}+\frac{1}{2}\times \frac{16}{310}$$
$$-\frac{1}{4}+\frac{1}{2}\times \frac{8}{155}$$
$$-\frac{1}{4}+\frac{1\times 8}{2\times 155}$$
$$-\frac{1}{4}+\frac{8}{310}$$
$$-\frac{1}{4}+\frac{4}{155}$$
$$-\frac{155}{620}+\frac{16}{620}$$
$$\frac{-155+16}{620}$$
$$-\frac{139}{620}$$
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$-\frac{139}{620} = -0.22419354838709676$
