$\frac{3}{4}$+$\frac{4}{10}$ = $\frac{15}{20}$+$\frac{8}{20}$ = $\frac{23}{20}$
$\frac{4}{3}$- $\frac{2}{7}$ = $\frac{28}{21}$- $\frac{6}{21}$ = $\frac{22}{21}$
4-$\frac{5}{12}$x$\frac{3}{10}$ = 4-$\frac{1}{8}$ = $\frac{32}{8}$- $\frac{1}{8}$ = $\frac{31}{8}$
$\frac{3}{5}$+$\frac{1}{2}$:(6x$\frac{2}{9}$) = $\frac{3}{5}$+$\frac{1}{2}$:$\frac{4}{3}$ = $\frac{3}{5}$+$\frac{1}{2}$x$\frac{3}{4}$ = $\frac{3}{5}$+$\frac{3}{8}$ = $\frac{24}{40}$+$\frac{15}{40}$ = $\frac{39}{40}$
xin hay nhất ạ
