Tham khảo
`a) 75%-\frac{11}{2}:\frac{4}{3}+1,5:\frac{-9}{4}-(-\frac{1}{2})`
`=\frac{3}{4}-\frac{33}{8}-\frac{2}{3}+\frac{1}{2}`
`=\frac{-85}{24}`
`b) \frac{-4}{9}.\frac{6}{13}+7\frac{4}{9}:\frac{13}{7}-5\frac{4}{9}-2`
`=\frac{-8}{39}+\frac{469}{117}-\frac{49}{9}-2`
`=\frac{-142}{39}`
`\text{©CBT}`