| Số | Số đối |
| $\frac{-8}{35}$ | $\frac{8}{35}$ |
| $\frac{5}{-6}$ | $\frac{5}{6}$ |
| $-\frac{18}{7}$ | $\frac{18}{7}$ |
| 1,15 | - 1,15 |
| -21,54 | 21,54 |
| $-\sqrt{7}$ | $\sqrt{7}$ |
| $\sqrt{5}$ | $-\sqrt{5}$ |
| Số | Số đối |
| $\frac{-8}{35}$ | $\frac{8}{35}$ |
| $\frac{5}{-6}$ | $\frac{5}{6}$ |
| $-\frac{18}{7}$ | $\frac{18}{7}$ |
| 1,15 | - 1,15 |
| -21,54 | 21,54 |
| $-\sqrt{7}$ | $\sqrt{7}$ |
| $\sqrt{5}$ | $-\sqrt{5}$ |