Tính
a, ₃$\frac{2}{5}$ x 1 $\frac{4}{7}$ + $\frac{12}{35}$
= $\frac{11}{5}$ x 1 = $\frac{32}{35}$
= $\frac{11}{5}$
b, $\frac{14}{3}$ - ₁$\frac{5}{9}$ $\frac{5}{9}$ x ₂$\frac{1}{4}$
= $\frac{15}{3}$ - $\frac{14}{9}$ = $\frac{5}{9}$ x 6
=31 = $\frac{54}{9}$