Phân số thích hợp điền vào chỗ chấm là:

3/11

\(\frac{7}{9}\,\, - \,\,\frac{2}{3}\,\, < \,\,.......\,\, < \,\,\frac{5}{6}\,\, - \,\,\frac{1}{2}\)

\(\frac{2}{9}\)

\(\frac{1}{6}\)

\(\frac{2}{5}\)

\(\frac{1}{5}\)

Giải thích

Đáp án đúng là: A

\(\frac{7}{9}\,\, - \,\,\frac{2}{3}\,\, = \,\,\frac{7}{9}\,\, - \,\,\frac{6}{9}\,\, = \,\,\frac{1}{9}\)

\(\frac{5}{6}\,\, - \,\,\frac{1}{2}\,\, = \,\,\frac{5}{6}\,\, - \,\,\frac{3}{6}\,\, = \,\,\frac{2}{6}\,\, = \,\,\frac{1}{3}\,\, = \,\,\frac{{1\,\, \times \,\,3}}{{3\,\, \times \,\,3}}\,\, = \,\,\frac{3}{9}\)

Do đó: \(\frac{1}{9}\,\, < \,\,\frac{{\bf{2}}}{{\bf{9}}}\,\, < \,\,\frac{3}{9}\)