a) Mik ko biết là 34 hay $\frac{3}{4}$ nên mik làm 2 cái nha (^,^)
TH1 : 34 + $\frac{5}{6}$
= $\frac{34}{1}$ + $\frac{5}{6}$
= $\frac{204}{6}$ + $\frac{5}{6}$
= $\frac{209}{6}$
TH2 : $\frac{3}{4}$ + $\frac{5}{6}$
= $\frac{9}{12}$ + $\frac{10}{12}$
= $\frac{19}{12}$.
b) 2 - $\frac{3}{5}$
= $\frac{2}{1}$ - $\frac{3}{5}$
= $\frac{10}{5}$ - $\frac{3}{5}$
= $\frac{7}{5}$
c) $\frac{8}{9}$ - $\frac{3}{5}$
= $\frac{40}{45}$ - $\frac{27}{45}$
= $\frac{13}{45}$
