Question

$(13.75-2\frac{19}{20} +5.4(-3\frac{1}{3} ))2.8+1\frac{17}{21}$ пожалуйста

Answer 1

$(13.75-2\frac{19}{20} +5.4(-3\frac{1}{3} ))2.8+1\frac{17}{21} = (13 \frac{3}{4} - 2 \frac{19}{20} + 5 \frac{2}{5} \times ( - \frac{10}{3} )) \times 2 \frac{4}{5} = \frac{55}{4} - \frac{59}{20} + \frac{27}{5} \times ( - \frac{10}{3} ) \times \frac{14}{5} = \frac{55}{4} - \frac{59}{20} - \frac{252}{5} = \frac{275 - 59 - 1008}{20} = - \frac{792}{20} = - 39.6$