a, \(\frac{5}{6}\) + \(\frac{7}{8}\) = \(\frac{5x8}{6x8}\) + \(\frac{7x6}{8x6}\) = \(\frac{40}{48}\) + \(\frac{42}{48}\) = \(\frac{82}{48}\) = \(\frac{41}{24}\)
b, \(4\frac{2}{3}\) x \(2\frac{3}{5}\) = \(\frac{4x3+2}{3}\) x \(\frac{2x5+3}{5}\) = \(\frac{14}{3}\) x \(\frac{13}{5}\) = \(\frac{14x13}{3x5}\) = \(\frac{182}{15}\)
c, \(4\frac{3}{4}\) - \(3\frac{2}{3}\) : \(\frac{11}{6}\) = \(\frac{4x4+3}{4}\) - \(\frac{3x3+2}{3}\) : \(\frac{11}{6}\) = \(\frac{19}{4}\) - \(\frac{11}{3}\) : \(\frac{11}{6}\) = \(\frac{19}{4}\) - \(\frac{11x6}{3x11}\) = \(\frac{19}{4}\) - \(\frac{66}{33}\) = \(\frac{19}{4}\) - \(\frac{2}{1}\) = \(\frac{19}{4}\) - \(\frac{2x4}{1x4}\) = \(\frac{19}{4}\) - \(\frac{8}{4}\) = \(\frac{11}{4}\)
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