a: \(=\dfrac{13}{4}\cdot2-\dfrac{5}{12}=\dfrac{13}{2}-\dfrac{5}{12}=\dfrac{73}{12}\)
b: \(=\left(\dfrac{14}{3}-\dfrac{13}{4}\right):\left(\dfrac{7}{12}-\dfrac{3}{10}\right)=\dfrac{17}{12}:\dfrac{17}{60}=5\)
c: \(=1-\dfrac{1}{4}=\dfrac{3}{4}\)
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