b, \(\dfrac{3}{5}\) - \(\dfrac{3}{8}\)
= \(\dfrac{24}{40}\) - \(\dfrac{15}{40}\)
= \(\dfrac{9}{40}\)
c, \(\dfrac{1}{4}\) + \(\dfrac{5}{6}\)
= \(\dfrac{6}{24}\) + \(\dfrac{20}{24}\)
= \(\dfrac{26}{24}\)
= \(\dfrac{13}{12}\)
a)\(\dfrac{6}{7}+\dfrac{5}{8}=\dfrac{6.8}{7.8}+\dfrac{5.7}{8.7}=\dfrac{48}{56}+\dfrac{35}{56}=\dfrac{83}{56}\)
d, \(\dfrac{4}{9}\) - \(\dfrac{1}{6}\)
= \(\dfrac{4\times2}{9\times2}\) - \(\dfrac{1\times3}{6\times3}\)
= \(\dfrac{8}{18}\) - \(\dfrac{3}{18}\)
= \(\dfrac{5}{18}\)
