[tex]3)~a=3 \frac{3}{8} : \frac{9}{4} -1,5 \\ \\ a = \frac{3*8+3}{8} * \frac{4}{9} - \frac{15}{10} \\ \\ a= \frac{27}{8}* \frac{4}{9} - \frac{3}{2} \\ \\ a= \frac{3}{2} - \frac{3}{2} \\ \\ a = 0 \\ \\ Opusul~lui~a~nu~exista~deoarece~a^{-1}= 0^{-1} = \frac{1}{0} ~ceea~ce~nu~are~sens. [/tex]
[tex]4)~[\frac{1}{6} + (- \frac{1}{3})^{2} } ]: \frac{5}{3} = \\ \\ = [ \frac{1}{6} + \frac{1}{9}] * \frac{3}{5} = \\ \\ = ( \frac{3}{18} + \frac{2}{18})* \frac{3}{5}= \\ \\ = \frac{5}{18}* \frac{3}{5}= \\ \\ = \frac{1}{6} [/tex]
Sper ca te-am ajutat!
