Explicación paso a paso:
[tex] \frac{2}{5} \div \frac{6}{10} - ( { \frac{3}{5} )}^{2} = \frac{2}{5} \times \frac{10}{6} - \frac{9}{25} = \frac{2}{3} - \frac{9}{25} = \frac{23}{75} [/tex]
