1. Điền số thích hợp vào ô trống trong bảng sau:
| $\frac{a}{b}$ | $\frac{2}{3}$ | ||||
| -$\frac{a}{b}$ | $\frac{1}{5}$ | ||||
| -$\left ( -\frac{a}{b} \right )$ | -$\frac{1}{3}$ | ||||
| $-\left (-\left ( -\frac{a}{b} \right ) \right )$ | -$\frac{1}{6}$ | 0 |
Bài Làm:
| $\frac{a}{b}$ | $\frac{2}{3}$ | $\frac{-1}{5}$ | -$\frac{1}{3}$ | $\frac{1}{6}$ | 0 |
| -$\frac{a}{b}$ | $\frac{-2}{3}$ | $\frac{1}{5}$ | $\frac{1}{3}$ | -$\frac{1}{6}$ | 0 |
| -$\left ( -\frac{a}{b} \right )$ | $\frac{2}{3}$ | $\frac{-1}{5}$ | -$\frac{1}{3}$ | $\frac{1}{6}$ | 0 |
| $-\left (-\left ( -\frac{a}{b} \right ) \right )$ | $\frac{-2}{3}$ | $\frac{1}{5}$ | $\frac{1}{3}$ | -$\frac{1}{6}$ | 0 |