MSC : \(35\)
\(\dfrac{2}{5}=\dfrac{2.7}{7.5}=\dfrac{14}{35}\\ \dfrac{3}{7}=\dfrac{3.5}{5.7}=\dfrac{15}{35}\\ 14< 15=>\dfrac{2}{5}< \dfrac{3}{7}\)
\(\dfrac{2}{5}=\dfrac{14}{35}< \dfrac{3}{7}=\dfrac{15}{35}\)
\(\Rightarrow\dfrac{2}{5}< \dfrac{3}{7}\)
`MSC : 35`
`2/5 = ( 2 xx7 ) / ( 5 x 7 ) = 14/35`
`3/7 = ( 3 xx 5)/(7 xx 5 ) = 15/35`
`14/35<15/35` hay `2/5 < 3/7`
MCNN: 35
2/5 x 7/7 = 14/35
3/7 x 5/5 = 15/35
=>14/35 < 15/35
=> 2/5 < 3/7
Mẫu số chung: 35
\(\dfrac{2}{5}=\dfrac{2\times7}{5\times7}=\dfrac{14}{35}
;
\dfrac{3}{7}=\dfrac{3\times5}{7\times5}=\dfrac{15}{35}\)
Vì \(\dfrac{14}{35}< \dfrac{15}{35}\) nên \(\Rightarrow\dfrac{2}{5}< \dfrac{3}{7}\)
- Chúc bạn học tốt :)) -