a. ( $\dfrac{-2}{3}$ + $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$ + ( $\dfrac{-1}{3}$ + $\dfrac{4}{7}$ : $\dfrac{4}{5}$
b. $\dfrac{5}{9}$ : ( $\dfrac{1}{11}$ - $\dfrac{5}{22}$ ) + $\dfrac{5}{9}$ : ( $\dfrac{1}{15}$ - $\dfrac{2}{3}$ )
$\text{Trả lời + giải thích lun ạ:33}$
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Sinh Học lớp 12
