Question

a) >; <; = ?

b) Viết các phân số sau theo thứ tự từ lớn đến bé:

\(\dfrac{1}{13},\dfrac{25}{13}\) và \(\dfrac{4}{39}\)                               \(\dfrac{2}{8},\dfrac{7}{4}\) và \(\dfrac{9}{16}\)

Answer 1

a)

 \(\dfrac{5}{6}< \dfrac{7}{6}\)

\(2=\dfrac{6}{3}\)

\(\dfrac{3}{7}>\dfrac{4}{14}\) (vì \(\dfrac{4}{14}=\dfrac{2}{7}\))

\(\dfrac{12}{20}< \dfrac{4}{5}\) (vì \(\dfrac{12}{20}=\dfrac{3}{5}\))

b) 

\(\dfrac{1}{13}=\dfrac{3}{39};\dfrac{25}{13}=\dfrac{75}{39}\)

\(\dfrac{75}{39}>\dfrac{4}{39}>\dfrac{3}{39}\rightarrow\dfrac{75}{39},\dfrac{4}{39},\dfrac{3}{39}\)

---------

\(\dfrac{2}{8}=\dfrac{4}{16};\dfrac{7}{4}=\dfrac{28}{16}\)

\(\dfrac{28}{16}>\dfrac{9}{16}>\dfrac{4}{16}\rightarrow\dfrac{28}{16},\dfrac{9}{16},\dfrac{4}{16}\)