Đáp án:
Giải thích các bước giải:
$a)= \dfrac{119}{35}+ \dfrac{10}{35}$
$= \dfrac{129}{35}$
$b)= \dfrac{2}{5}+ \dfrac{4}{15}$
$= \dfrac{6}{15}+ \dfrac{4}{15}$
$= \dfrac{10}{15}= \dfrac{2}{3}$
$c)= 2- \dfrac{1}{6}$
$= \dfrac{12}{6}- \dfrac{1}{6}$
$= \dfrac{11}{6}$
$d)= \dfrac{5}{12}+ \dfrac{2}{9}$
$= \dfrac{15}{36}+ \dfrac{8}{36}$
$= \dfrac{23}{36}$