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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{3}{8}\)
\(\dfrac{7}{13}\)
\(\dfrac{2}{3}\)
\(\dfrac{1}{2}\)
\(\dfrac{3}{125}\)
\(\dfrac{15}{40}\) = \(\dfrac{3}{8}\) rút gọn cho 5
\(\dfrac{21}{39}\) = \(\dfrac{7}{13}\) rút gọn cho 3
\(\dfrac{16}{24}\) = \(\dfrac{4}{6}\) rút gọn cho 4
\(\dfrac{36}{72}\) = \(\dfrac{4}{8}\) rút gọn cho 9
\(\dfrac{24}{1000}\) = \(\dfrac{3}{125}\) rút gọn cho 8
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{64}{1000}=\dfrac{64:8}{1000:8}=\dfrac{8}{125}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{Giải:}\)
\(\frac{678}{1000}=\frac{678:2}{1000:2}=\frac{339}{500}\)
\(\text{Hoc tốt!!!}\)
\(\frac{678}{1000}\)
\(=\frac{339\cdot2}{500\cdot2}\)
\(=\frac{339}{500}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{24}{1000}=\frac{24:8}{1000:8}=\frac{3}{125}.\)
Ta rút gọn như sau:
\(\frac{24}{1000}=\frac{24\div8}{1000\div8}=\frac{3}{125}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{150}{100}=1\frac{1}{2};\frac{90}{150}=\frac{3}{5};\frac{678}{1000}=\frac{339}{500}\)
Học tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{15}{40}\)= \(\frac{3}{8}\)
\(\frac{21}{39}\)= \(\frac{7}{13}\)
\(\frac{16}{24}\)= \(\frac{4}{6}\)= \(\frac{2}{3}\)
\(\frac{36}{72}\)= \(\frac{1}{2}\)
\(\frac{24}{1000}\)= \(\frac{12}{500}\)= \(\frac{6}{250}\)= \(\frac{3}{125}\)
15/40=3/8
21/39=7/13
16/24=2/3
36/72=1/2
24/1000=3/125