\(\dfrac{5}{9}\div\left(\dfrac{1}{11}-\dfrac{5}{22}\right)+\dfrac{5}{9}\div\left(\dfrac{1}{15}-\dfrac{2}{3}\right)\)
\(=\dfrac{5}{9}\div-\dfrac{3}{22}+\dfrac{5}{9}\div-\dfrac{3}{5}\)
\(=\dfrac{5}{9}.-\dfrac{22}{3}+\dfrac{5}{9}.-\dfrac{5}{3}\)
\(=\dfrac{5}{9}.\left(-\dfrac{22}{3}+-\dfrac{5}{3}\right)\)
\(=\dfrac{5}{9}.-9\)
\(=-5\)
c) \(\dfrac{5^{16}.27^7}{125^5.9^{11}}=\dfrac{5^{16}.3^{21}}{5^{15}.3^{22}}=\dfrac{5}{3}\)
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