Viết số thích hợp vào chỗ chấm:

\(\frac{7}{6}\,\, = \,\,\frac{{7\,\, \times \,\,........}}{{6\,\, \times \,\,\,........}}\,\, = \,\,\frac{{35}}{{\,........}}\)

\(\frac{{49}}{{63}}\,\, = \,\,\frac{{49\,\,:\,\,7}}{{\,........\,\,:\,\,7}}\,\, = \,\,\frac{{\,........}}{{\,........}}\)

\(\frac{9}{5}\,\, = \,\,\frac{{9\,\, \times \,\,\,........}}{{5\,\, \times \,\,\,........}}\,\, = \,\,\frac{{81}}{{\,........}}\)

\(\frac{{72}}{{64}}\,\, = \,\,\frac{{72\,\,:\,\,\,........}}{{\,........\,\,:\,\,\,........}}\,\, = \,\,\frac{9}{{\,........}}\)

\(\frac{4}{9}\,\, = \,\,\frac{{\,........\,\, \times \,\,4}}{{9\,\, \times \,\,4}}\,\, = \,\,\frac{{\,........}}{{\,........}}\)

\(\frac{{18}}{{81}}\,\, = \,\,\frac{{18\,\,:\,\,\,........}}{{81\,\,:\,\,\,........}}\,\, = \,\,\frac{2}{{\,........}}\)