Tham khảo
`a) \frac{3}{4}:(\frac{1}{2}.\frac{6}{5})`
`=\frac{3}{4}:\frac{3}{5}`
`=\frac{5}{4}`
`b) \frac{4}{7}+\frac{6}{7}:3-\frac{3}{8}`
`=\frac{4}{7}+\frac{2}{7}-\frac{3}{8}`
`=\frac{6}{7}-\frac{3}{8}=\frac{27}{56}`
`c) (\frac{3}{7}:\frac{2}{5}):\frac{3}{4}`
`=\frac{15}{14}:\frac{3}{4}`
`=\frac{10}{7}`
`d) (\frac{7}{12}.\frac{9}{14}):\frac{1}{2}`
`=\frac{3}{8}:\frac{1}{2}`
`=\frac{3}{4}`
`\text{©CBT}`