Question

So sánh hai phân số:   4/5/    và    2/7

Answer 1

Muốn so sánh đc phải quy đồng:

\(\frac{4}{5}=\frac{4.7}{5.7}=\frac{28}{35}\)

\(\frac{2}{7}=\frac{2.5}{7.5}=\frac{10}{35}\)

VÌ \(\frac{28}{35}\)>\(\frac{10}{35}\)

\(\rightarrow\)\(\frac{4}{5}\)>\(\frac{2}{7}\)

Answer 2

4/5 = 28/35

2/7 = 10/35

Vì 28/35 > 10/35 => 4/5 > 2/7

Vậy 4/5 > 2/7

Answer 3

\(\frac{4}{5}\)=\(\frac{4\times7}{5\times7}\)=\(\frac{28}{35}\)

\(\frac{2}{7}\)=\(\frac{2\times5}{5\times7}\)=\(\frac{10}{37}\)

\(Vì\) \(28>10\)\(Nên\) \(\frac{28}{35}\)\(>\frac{10}{35}\)

                       \(\Rightarrow\frac{4}{5}\)\(>\frac{2}{7}\)