Question

Sắp xếp các số \(2;\,\frac{5}{{ - 6}}; \frac{3}{5};\, - 1;\,\frac{{ - 2}}{5};\,0\) theo thứ tự tăng dần.

Answer 1

 Ta có: \(\frac{5}{{ - 6}} = \frac{{ - 5}}{6} = \frac{{ - 5.5}}{{6.5}} = \frac{{ - 25}}{{30}}\)

\(\frac{{ - 2}}{5} = \frac{{ - 2.6}}{{5.6}} = \frac{{ - 12}}{{30}}\)

\( - 1 = \frac{{ - 30}}{{30}}\)

Do \(\frac{{ - 30}}{{30}} < \frac{{ - 25}}{{30}} < \frac{{ - 12}}{{30}}<0\) nên \( - 1 < \frac{5}{{ - 6}} < \frac{{ - 2}}{5}<0\)

Mặt khác, \(0 < \frac{3}{5} < 2\)

Sắp xếp theo thứ tự tăng dần:

\( - 1;\,\frac{5}{{ - 6}};\frac{{ - 2}}{5};\,0; \frac{3}{5}; \,2\).

Answer 2

\(2=\dfrac{120}{60};\dfrac{5}{-6}=\dfrac{-50}{60};\dfrac{3}{5}=\dfrac{36}{60};-1=-\dfrac{60}{60};-\dfrac{2}{5}=-\dfrac{24}{60};0=\dfrac{0}{60}\)

\(-60< -50< -24< 0< 36< 120\)

=>\(-1< -\dfrac{5}{6}< -\dfrac{2}{5}< 0< \dfrac{3}{5}< 2\)