Question

{-1/5+[5/2-(3/10-1/2)]}
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Answer 1

$\frac{-1}{5}+(\frac{5}{2}-(\frac{3}{10}-\frac{1}{2} ) \\\\\frac{-1}{5}+(\frac{5}{2}-(\frac{-1}{5} ))\\\\\\\frac{-1}{5}+(\frac{5}{2}+\frac{1}{5} )\\\\\frac{-1}{5}+\frac{27}{10} \\\\\frac{5}{2}$