Moi nguoi oi giup minh voi

Đáp án+Giải thích các bước giải:

$\dfrac{2}{3}$ + $\dfrac{1}{5}$ = $\dfrac{10}{15}$ + $\dfrac{3}{15}$ = $\dfrac{13}{15}$

$\dfrac{3}{5}$ + $\dfrac{5}{6}$ = $\dfrac{18}{30}$ + $\dfrac{25}{30}$ = $\dfrac{43}{30}$

$\dfrac{1}{2}$ - $\dfrac{3}{8}$ = $\dfrac{4}{6}$ - $\dfrac{3}{8}$ = $\dfrac{1}{8}$

$\dfrac{11}{24}$ - $\dfrac{3}{8}$ = $\dfrac{11}{24}$ - $\dfrac{9}{24}$ = $\dfrac{1}{12}$

$\dfrac{2}{5}$ x $\dfrac{7}{9}$ = $\dfrac{14}{45}$

$\dfrac{3}{7}$ + $\dfrac{9}{14}$ = $\dfrac{6}{14}$ + $\dfrac{9}{14}$ = $\dfrac{15}{14}$

$\dfrac{5}{12}$ + $\dfrac{3}{4}$ = $\dfrac{5}{12}$ + $\dfrac{9}{12}$ = $\dfrac{7}{6}$$

$\dfrac{3}{4}$ - $\dfrac{5}{12}$ = $\dfrac{9}{12}$ - $\dfrac{5}{12}$ = $\dfrac{1}{3}$

$\dfrac{29}{36}$ - $\dfrac{9}{34}$ = $\dfrac{58}{72}$ - $\dfrac{27}{72}$ = $\dfrac{31}{72}$

$\dfrac{3}{8}$ x $\dfrac{11}{12}$ = $\dfrac{11}{32}$