[tex]1 \dfrac{2}{5} \times (4 \dfrac{1}{7} - 3 \dfrac{1}{14} ) = \\ \\ \\ \dfrac{7}{5} \times ( \dfrac{29}{7}^{ \times 2} + \dfrac{43}{14} ) = \\ \\ \\ \dfrac{7}{5} \times ( \dfrac{58}{14} + \dfrac{43}{14} ) = \\ \\ \\ \dfrac{7}{5} \times \dfrac{101}{14} = = > 7 \: cu \: 14 \: se \: reduc = = > \dfrac{1}{10} [/tex]
