Question

rút gọn r quy đồng

\(\frac{9}{30};\frac{98}{80};\frac{15}{1000}\)

Answer 1

Rút gọn :

\(\frac{9}{30}=\frac{9:3}{30:3}=\frac{3}{10}\)

\(\frac{98}{80}=\frac{98:2}{80:2}=\frac{49}{40}\)

\(\frac{15}{1000}=\frac{15:5}{1000:5}=\frac{3}{200}\)

Quy đồng :

\(\frac{3}{10}=\frac{3.20}{10.20}\frac{60}{200}\)

\(\frac{49}{40}=\frac{49.5}{40.5}=\frac{245}{200}\)

\(\frac{3}{200}=\frac{3}{200}\)

Answer 2

\(\frac{9}{30}=\frac{3}{10};\frac{98}{80}=\frac{49}{40};\frac{15}{1000}=\frac{3}{200}\)

MSC của \(\frac{3}{10};\frac{49}{40};\frac{3}{200}\)là :200

Có : \(\frac{3}{10}=\frac{60}{200}\)

       \(\frac{49}{40}=\frac{245}{200}\)

      \(\frac{3}{200}=\frac{3}{200}\)