m ) \(3\dfrac{1}{4}:\left(-\dfrac{4}{5}\right)-2\dfrac{5}{4}.\left(-\dfrac{4}{5}\right)\\ =\left(3\dfrac{1}{4}-2\dfrac{5}{4}\right):\left(-\dfrac{4}{5}.-\dfrac{4}{5}\right)\\ =0:\left(\dfrac{4}{5}\right)\\ =0\)
n ) \(5\dfrac{4}{3}:\left(\dfrac{7}{6}\right)+5\dfrac{1}{3}.\left(-\dfrac{7}{6}\right)\\ =\left(5\dfrac{4}{3}+5\dfrac{1}{3}\right):\left(\dfrac{7}{6}.-\dfrac{7}{6}\right)\\ =\dfrac{35}{3}:1\\ =\dfrac{35}{3}\)
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