Question

помогите даю 15 баллов

Answer 1

$\frac{3}{5}*\frac{6}{5}+\frac{5}{2}*\frac{2}{5}-1*\frac{9}{10}=\frac{3}{5}+1-\frac{9}{10}=\frac{6}{10}+\frac{10}{10}-\frac{9}{10}=\frac{7}{10}$