Phạm Ngọc Gia Hân
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2024-02-14 10:58:34
a) \(\dfrac{-2}{7}\)+ \(\dfrac{2}{7}\): \(\dfrac{3}{5}\)
= \(\dfrac{-2}{7}\)+ \(\dfrac{2}{7}\) . \(\dfrac{5}{3}\)
= \(\dfrac{-2}{7}\)+ \(\dfrac{10}{21}\)
= \(\dfrac{-6}{21}\)+ \(\dfrac{10}{21}\)
=\(\dfrac{\left(-6\right)+10}{21}\)
=\(\dfrac{4}{21}\)
b) \(\dfrac{-8}{19}\)+ \(\dfrac{-4}{21}\)- \(\dfrac{17}{21}\)+ \(\dfrac{27}{19}\)
= \(\dfrac{-8}{19}\)+ \(\dfrac{-4}{21}\)+ \(\dfrac{17}{21}\)+ \(\dfrac{27}{19}\)
=(\(\dfrac{-8}{19}\)+ \(\dfrac{27}{19}\)) + ( \(\dfrac{-4}{21}\)+\(\dfrac{-17}{21}\))
=