Question

очень срочно!!!!!!!!

Answer 1

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