3/2=150/100

2/5=40/100

777/700=111/100

639/3000=213/1000

12/24=1/2=50/100

1818/1515=6/5=120/100

Đáp án:

\(\begin{array}{l} a)\,\,\frac{3}{2} = \frac{{3 \times 50}}{{2 \times 50}} = \frac{{150}}{{100}}\,\,\,; b)\,\,\,\frac{2}{5} = \frac{{2 \times 20}}{{5 \times 20}} = \frac{{40}}{{100}}\\ c)\,\,\frac{{777}}{{700}} = \frac{{777:7}}{{700:7}} = \frac{{111}}{{100}};\,\,\, d)\,\,\frac{{639}}{{3000}} = \frac{{639:3}}{{3000:\,3}} = \frac{{213}}{{1000}}\,\,\,(k\,viet\,duoc\,\,phan\,so\,co\,mau\,la\,100)\\ e)\frac{{12}}{{24}} = \frac{{12:12}}{{24:12}} = \frac{1}{2} = \frac{{1 \times 50}}{{2 \times 50}} = \frac{{50}}{{100}};\\ f)\,\,\frac{{1818}}{{1515}} = \frac{{1818:101}}{{1515:101}} = \frac{{18}}{{15}} = \frac{{18:3}}{{15:3}} = \frac{6}{5} = \frac{{6 \times 20}}{{5 \times 20}} = \frac{{120}}{{100}} \end{array}\)