Điền số thích hợp vào chỗ chấm.

\(\frac{{72}}{{96}} = \frac{{........}}{{48}} = \frac{{.......}}{{12}}\)  

\(\frac{{180}}{{240}} = \frac{{45}}{{.......}} = \frac{{15}}{{.......}}\)

\(\frac{{48}}{{42}} = \frac{{.......}}{{14}} = \frac{8}{{.......}}\) 

\(\frac{{56}}{{72}} = \frac{{.......}}{{18}} = \frac{{.......}}{9}\)

\(\frac{{3 \times 4 \times 8 \times 6}}{{12 \times 6 \times 8 \times 4}} = \frac{1}{4}\)

Giải thích

\[\frac{{3 \times 4 \times 8 \times 6}}{{12 \times 6 \times 8 \times 4}} = \frac{{3 \times \not 4 \times \not 8 \times \not 6}}{{12 \times \not 6 \times \not 8 \times \not 4}} = \frac{3}{{12}} = \frac{1}{4}\]

\(\frac{{14 \times 20 \times 9 \times 2}}{{2 \times 7 \times 10 \times 9}} = 4\)

Giải thích

\(\frac{{14 \times 20 \times 9 \times 2}}{{2 \times 7 \times 10 \times 9}} = \frac{{14 \times 20 \times \not 9 \times \not 2}}{{\not 2 \times 7 \times 10 \times \not 9}} = \frac{{14 \times 20}}{{7 \times 10}} = \frac{{2 \times 2}}{{1 \times 1}} = 4\)

\(\frac{{5 \times 9 \times 12}}{{3 \times 9 \times 4 \times 5}} = 1\)

Giải thích

\[\frac{{5 \times 9 \times 12}}{{3 \times 9 \times 4 \times 5}} = \frac{{\not 5 \times \not 9 \times 12}}{{3 \times \not 9 \times 4 \times \not 5}} = \frac{{12}}{{3 \times 4}} = 1\]

\(\frac{{8 \times 18 \times 21}}{{7 \times 6 \times 3 \times 24}} = 1\)

Giải thích

\[\frac{{8 \times 18 \times 21}}{{7 \times 6 \times 3 \times 24}} = \frac{{\not 8 \times \not 6 \times \not 3 \times \not 7 \times \not 3}}{{\not 7 \times \not 6 \times \not 3 \times \not 8 \times \not 3}} = 1\]