Question

помогите даю 15 баллов

Answer 1

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