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\(\dfrac{4}{20}\) = \(\dfrac{1}{5}\) và \(\dfrac{1}{4}=\dfrac{4}{16}\)
Vậy phân số cần tìm là: \(\dfrac{4}{17};\dfrac{4}{18};\dfrac{4}{19}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{5}=\dfrac{10}{25}=\dfrac{12}{30}=\dfrac{14}{35}=\dfrac{16}{40}=\dfrac{18}{45}=\dfrac{20}{50}=\dfrac{22}{55}=\dfrac{24}{60}=\dfrac{26}{65}=\dfrac{28}{70}=\dfrac{30}{75}=\dfrac{32}{80}=\dfrac{34}{85}=\dfrac{36}{85}=\dfrac{38}{90}=\dfrac{40}{95}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{3}{7};\frac{7}{3};\frac{3}{13};\frac{13}{3};\frac{3}{29};\frac{29}{3};\frac{7}{13};\frac{13}{7};\frac{7}{29};\frac{29}{7};\frac{13}{29};\frac{29}{13}\)
b)\(\frac{9}{5};\frac{53}{5};\frac{75}{5};\frac{53}{9};\frac{75}{9};\frac{75}{53}\)
c)\(\frac{1}{8};\frac{8}{1};\frac{2}{7};\frac{7}{2};\frac{3}{6};\frac{6}{3};\frac{4}{5};\frac{5}{4};\frac{0}{9};\frac{9}{0}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Bài \) \(1\)\(:\)
\(\frac{5}{11}\)\(;\)\(\frac{5}{14}\)\(;\)\(\frac{5}{13}\)\(;\)\(\frac{5}{12}\)
\(Bài\) \(1\)\(:\)
\(\frac{8}{10};\frac{8}{11};\frac{8}{12};\frac{8}{13};\frac{4}{6};\frac{12}{16};\frac{12}{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{4}va\frac{5}{3}\)
\(\frac{5}{4}va\frac{5}{3}\)
NHO K CHO MK NHA
CHUC BAN HOC GIOI ^_^