Question

So sánh phân số bằng hai cách khác nhau :

7/2 và 2/3

Answer 1

\(MSC:6\)

\(\dfrac{7}{2}=\dfrac{7.3}{2.3}=\dfrac{21}{6}\)

\(\dfrac{2}{3}=\dfrac{2.2}{3.2}=\dfrac{4}{6}\)

21>4 nên \(\dfrac{7}{2}>\dfrac{2}{3}\)

Answer 2

\(\dfrac{7}{2}=\dfrac{7.3}{2.3}=\dfrac{21}{6};\dfrac{2}{3}=\dfrac{2.2}{3.2}=\dfrac{4}{6}\)

Do\(\dfrac{21}{6}>\dfrac{4}{6}=>\dfrac{7}{2}>\dfrac{2}{3}\)

Answer 3

C1:

\(MSC:6\\ \dfrac{7}{2}=\dfrac{7\times3}{2\times3}=\dfrac{21}{6};\dfrac{2}{3}=\dfrac{2\times2}{3\times2}=\dfrac{4}{6}\\ 21>4\\ \Rightarrow\dfrac{7}{2}>\dfrac{2}{3}\)

C2:

\(\dfrac{7}{2}>1;\dfrac{2}{3}< 1\\ \Rightarrow\dfrac{7}{2}>\dfrac{2}{3}\)