Question

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО ДАЮ 30 БАЛЛОВ !!!

Answer 1

$56\frac{1}{10}-28 \frac{3}{8} =55\frac{11}{10} -28\frac{3}{8}=55\frac{44}{40}-28\frac{15}{40}=27\frac{29}{40}$

$1\frac{1}{21} -b=\frac{52}{63} \\b=\frac{66}{63} -\frac{52}{63} \\b=\frac{14}{63} =\frac{2}{9}$