Đáp án:
`\frac{2}{5} - \frac{3}{17} + \frac{7}{19} - (\frac{-3}{5}) + (\frac{-14}{17})`
`= \frac{2}{5} - \frac{3}{17} + \frac{7}{19} + \frac{3}{5} - \frac{-14}{17}`
`= (\frac{2}{5} + \frac{3}{5}) - (\frac{3}{17} + \frac{14}{17}) + \frac{7}{19}`
`= 1 - 1 + \frac{7}{19}`
`= 0 + \frac{7}{19}`
`= \frac{7}{19}`
Chúc học tốt!!!