a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)

a -\(\dfrac{2}{7}\)+\(\dfrac{2}{7}\):\(\dfrac{3}{5}\)

=\(\dfrac{-2}{7}\)+\(\dfrac{10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\) +\(\dfrac{27}{19}\)

=[\(\dfrac{\left(-8\right)}{19}\) +\(\dfrac{27}{19}\)]+[\(\dfrac{\left(-4\right)}{21}\)-\(\dfrac{17}{21}\)]

=1+(-1)

=0

c)\(\dfrac{6}{5}\).\(\dfrac{3}{13}\)-\(\dfrac{6}{5}\).\(\dfrac{16}{13}\)

=\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))

=\(\dfrac{6}{5}\).(-1)

=\(\dfrac{\left(-6\right)}{5}\)