3/20 --> 15/100
27/300--> 9/100
400/1000--> 40/100
2/10--> 20/100
hc tốt
3/20=15/100 ; 27/300=9/100 ; 400/1000=40/100 ; 2/10 = 20/100 Đây nha bạn !!!
\(\frac{3}{20}\)=\(\frac{15}{100}\)
\(\frac{27}{300}\)=\(\frac{9}{100}\)
\(\frac{400}{1000}\)=\(\frac{40}{10}\)
\(\frac{2}{10}\)=\(\frac{20}{100}\)
nha bn
hc tốt