помогите.!!!!! СПС

A)
$1) \frac{5}{6} *(-0,3)= \frac{5}{6} *(- \frac{3}{10} )= -\frac{1}{4} \\ 2) \frac{4}{5} :1 \frac{1}{15} = \frac{4}{5}: \frac{16}{15} = \frac{4}{5} * \frac{15}{16} = \frac{3}{4} \\ 3)- \frac{1}{4} - \frac{3}{4} =-1 \\ \\ b) \\ 1) (- \frac{4}{5}) ^{2} =- \frac{4}{5} *(- \frac{4}{5} )= \frac{16}{25} \\ 2) \frac{16}{25}*1 \frac{9}{16}= \frac{16}{25} * \frac{25}{16} =1 \\ 3)1*(-2)=-2$