Viết các phân số 3/2 ; 1/4 ; 17/5 ; 3/10 ; 17/25 ; 67/125 ; 21/25 ; 9/20 ; 11/40 dưới dạng số thập phân:

\(\frac{3}{2} = \frac{{3 \times 5}}{{2 \times 5}} = \frac{{15}}{{10}} = 1,5\)

\(\frac{1}{4} = \frac{{1 \times 25}}{{4 \times 25}} = \frac{{25}}{{100}} = 0,25\)

\(\frac{{17}}{5} = \frac{{17 \times 2}}{{5 \times 2}} = \frac{{34}}{{10}} = 3,4\)

\(\frac{3}{{10}} = 0,3\)

\(\frac{{17}}{{25}} = \frac{{17 \times 4}}{{25 \times 4}} = \frac{{68}}{{100}} = 0,68\)

\(\frac{{67}}{{125}} = \frac{{67 \times 8}}{{125 \times 8}} = \frac{{536}}{{1\,\,000}}\)

\(\frac{{21}}{{25}} = \frac{{21 \times 4}}{{25 \times 4}} = \frac{{48}}{{100}}\)

\(\frac{9}{{20}} = \frac{{9 \times 5}}{{20 \times 5}} = \frac{{45}}{{100}}\)

\(\frac{{11}}{{40}} = \frac{{11 \times 25}}{{40 \times 25}} = \frac{{275}}{{1\,\,000}}\)