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2024-03-06 18:11:45
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)
=\(\dfrac{\left(-6\right)}{5}\)