Viết các phân số dưới dạng mẫu dương:
\(\dfrac{-15}{-17};\dfrac{3}{-25};\dfrac{-1}{-5};\dfrac{6}{-23}\)
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a) \(\dfrac{2}{5}=\dfrac{1}{5}\cdot\dfrac{2}{1}\)
\(\dfrac{15}{12}=\dfrac{5}{4}=\dfrac{5}{2}\cdot\dfrac{1}{2}\)
\(\dfrac{5}{-12}=\dfrac{-5}{12}=\dfrac{-5}{3}\cdot\dfrac{1}{4}\)
\(\dfrac{-3}{-4}=\dfrac{3}{4}=\dfrac{3}{2}\cdot\dfrac{1}{2}\)
\(\dfrac{52}{71};\)\(\dfrac{-4}{17};\)\(\dfrac{-5}{29};\dfrac{-31}{33}\).
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Ta có \(\dfrac{14}{15}\) = \(\dfrac{2}{3}\) : \(\dfrac{5}{7}\)
= \(\dfrac{7}{3}\) : \(\dfrac{5}{2}\)
= \(\dfrac{2}{5}\) : \(\dfrac{3}{7}\)
= \(\dfrac{7}{5}\) : \(\dfrac{3}{2}\)
\(a,-\dfrac{10}{21}=\dfrac{-2}{7}.\dfrac{5}{3}=\dfrac{-2}{3}.\dfrac{5}{7}\\ b,\dfrac{2}{21}=\dfrac{1}{3}.\dfrac{2}{7}=\dfrac{1}{7}.\dfrac{2}{3}\\ c,\dfrac{8}{15}=\dfrac{2}{3}.\dfrac{4}{5}=\dfrac{4}{3}.\dfrac{2}{5}\)
\(\dfrac{-15}{-17}=\dfrac{15}{17}\\ \dfrac{3}{-25}=\dfrac{-3}{25}\\ \dfrac{-1}{-5}=\dfrac{1}{5}\\ \dfrac{6}{-23}=\dfrac{-6}{23}\)