Question

с+d-8,3. при с=-9целых 4/5; d =-1целая 9/20

Answer 1

С+d-8,3
$-9 frac{4}{5} +(-1 frac{9}{20}) -8,3 = - frac{49}{5} - frac{29}{20} - frac{83}{10} = - frac{391}{20} = -19 frac{11}{20} =-19, 55.$