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a, đó là : \(\dfrac{5}{10};\dfrac{10}{20};\dfrac{50}{100}....\)
b, Đó là : \(\dfrac{18}{35};\dfrac{72}{140};\dfrac{108}{210}.....\)
c, Là : \(\dfrac{14}{20};\dfrac{35}{50};\dfrac{140}{200}.....\)
2
\(a,\dfrac{3}{2};\dfrac{4}{3};\dfrac{5}{4};\dfrac{6}{5};\dfrac{7}{6}\)
\(b,\dfrac{2}{2};\dfrac{3}{3};\dfrac{4}{4};\dfrac{5}{5};\dfrac{6}{6}\)
\(c,\dfrac{2}{3};\dfrac{3}{4};\dfrac{4}{5};\dfrac{5}{6};\dfrac{6}{7}\)
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