Explicație pas cu pas:
[tex]( \frac{1}{5} + \frac{1}{5} \div (1 - \frac{4}{5} )) \div \frac{3}{10} \\ \\ ( \frac{1}{5} + \frac{1}{5} \div (\frac{5 - 4}{5} )) \div \frac{3}{10} \\ \\ (\frac{1}{5} + \frac{1}{5} \div \frac{1}{5} ) \div \frac{3}{10} \\ \\ ( \frac{1}{5} + \frac{1}{5} \times \frac{5}{1} ) \div \frac{3}{10} \\ \\ (\frac{1}{5} +1) \div \frac{3}{10} \\ \\ \frac{6}{5} \times \frac{10}{3}=2*2=4[/tex]
