(-4/15+23/9)•0,4= (31/6-25/4)•(13/4-0,55)

$1)( - \frac{4}{15} + \frac{23}{9} ) * 0,4 = = ( - \frac{4*3}{15*3} + \frac{23*5}{9*5} ) * 0,4 = \\ \\ \\ = \frac{115-12}{45} * \frac{4}{10} = \frac{103*2}{45*5} = \frac{206}{225} \\ \\ \\ 2) ( \frac{31}{6} - \frac{25}{4}) * ( \frac{13}{4} -0,55) = \frac{31*2-25*3}{12} * (3,25-0,55) = \\ \\ = \frac{62-75}{12} * 2,7 = - \frac{13}{12} * \frac{27}{10} = - \frac{13*9}{4*10} = - \frac{117}{40} = -2,925$