Đáp án:
Giải thích các bước giải:
$\dfrac{5}{9}:(\dfrac{1}{11}-\dfrac{5}{22})+\dfrac{5}{9}:(\dfrac{1}{15}-\dfrac{2}{3})$
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$=\dfrac{5}{9}:\dfrac{-3}{22}+\dfrac{5}{9}:\dfrac{-3}{5}$
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$=\dfrac{5}{9}.\dfrac{-22}{3}+\dfrac{5}{9}.\dfrac{-5}{3}$
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$=\dfrac{-5}{9}.(-9)$
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$=5$