Quy đồng mẫu số 2/3 , 3/4 , 4/6.
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bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
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\(\dfrac{1}{2}+\dfrac{2}{4}\\ \dfrac{2}{4}=\dfrac{1\cdot2}{2\cdot2}=\dfrac{2}{4}\\ \dfrac{3}{-12}+\dfrac{4}{12}\\ \dfrac{3}{-12}=\dfrac{-3}{12}\\ \dfrac{4}{6}=\dfrac{4\cdot2}{6\cdot2}=\dfrac{8}{12}\\ \dfrac{-3}{12}+\dfrac{8}{13}=\dfrac{5}{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{3}{4}=\dfrac{3\cdot9}{4\cdot9}=\dfrac{27}{36}\)
\(\dfrac{5}{6}=\dfrac{5\cdot6}{6\cdot6}=\dfrac{30}{36}\)
\(\dfrac{4}{9}=\dfrac{4\cdot4}{9\cdot4}=\dfrac{16}{36}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3/4 : 5/6 và 4/9 ( MC = 36 )
3/4 = 27/36
5/6 = 30/36
4/9 = 16/36.
\(\dfrac{3}{4}\);\(\dfrac{5}{6}\)và \(\dfrac{4}{9}\).
\(\dfrac{3}{4}\)=\(\dfrac{27}{36}\);\(\dfrac{5}{6}\)=\(\dfrac{30}{36}\) và \(\dfrac{4}{9}\)=\(\dfrac{16}{36}\)
mẫu số chung 12 quy đồng mẫu số 3 phân số được : 8/12,9/12,8/12