Question

очень срочно!!!!!!!!

Answer 1

$3frac{5}{7}*2frac{5}{8}a*1frac{11}{13}=frac{26}{7}*frac{21}{8}a*frac{24}{13}=2*3a*3=18a \ 4frac{3}{8}*4b*2frac{4}{7}=frac{35}{8}*4b*frac{18}{7}=45b$