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a: \(\dfrac{1+x}{6}=\dfrac{2}{3}\)
=>x+1=4
hay x=3
\(\dfrac{48}{56}=\dfrac{6}{\left(x-3\right)}\)
=>6/x-3=6/7
=>x-3=7
hay x=10
b: Đề thiếu rồi bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{8}=\frac{15}{24};\frac{25}{30}=\frac{20}{24};\frac{15}{45}=\frac{8}{24};\frac{2}{1}=\frac{48}{24}\)k nha
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a.
\(4=\dfrac{48}{12}\);\(\dfrac{9}{4}=\dfrac{27}{12}\)
b. \(\dfrac{5}{8}=\dfrac{15}{24};\dfrac{25}{30}=\dfrac{20}{24}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{8}\)\(=\frac{5x30}{8x30}\)\(=\frac{150}{240}\)
\(\frac{25}{30}\)\(=\frac{25x8}{30x8}\)\(=\frac{200}{240}\)
\(\frac{5}{8}=\frac{5\text{x}30}{8\text{x}30}=\frac{150}{240}\)
\(\frac{25}{30}=\frac{25\text{x}8}{30\text{x}8}=\frac{200}{240}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{5}{8}=\dfrac{15}{24};\dfrac{25}{30}=\dfrac{5}{6}=\dfrac{20}{24}.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
câu 1:\(\frac{48}{12}\);\(\frac{27}{12}\)
câu 2:\(\frac{150}{240}\);\(\frac{190}{240}\)
\(\dfrac{5}{8}\) = \(\dfrac{15}{24}\)
\(\dfrac{25}{30}\) = \(\dfrac{5}{6}\) = \(\dfrac{20}{24}\)