Question

Answer 1

Bài 4A:

a)Ta có: \(\dfrac{2}{7}=\dfrac{10}{35};\dfrac{1}{5}=\dfrac{7}{35}\)             

Mà \(\dfrac{10}{35}>\dfrac{7}{35}=>\dfrac{2}{7}>\dfrac{1}{5}\)

b)Ta có: \(\dfrac{-11}{6}=\dfrac{-99}{54};\dfrac{8}{-9}=\dfrac{-48}{54}\)

Mà \(\dfrac{-99}{54}< \dfrac{-48}{54}=>\dfrac{-11}{6}< \dfrac{8}{-9}\)

c)Vì \(2016< 2018=>\dfrac{2017}{2016}>\dfrac{2017}{2018}\)

d)Ta có: \(-\dfrac{249}{333}=\dfrac{-83.3}{111.3}=\dfrac{-83}{111}\)

Bài 4B:

Ta có: \(\dfrac{2}{5}=\dfrac{6}{15};\dfrac{1}{3}=\dfrac{5}{15}\)

Mà\(\dfrac{6}{15}>\dfrac{5}{15}=>\dfrac{2}{5}>\dfrac{1}{3}\)

b)Vì \(-\dfrac{9}{5}< 0;\dfrac{11}{6}>0=>-\dfrac{9}{5}< \dfrac{11}{6}\)

c)Vì \(\dfrac{34}{35}< 1;\dfrac{35}{34}>1=>\dfrac{34}{35}< \dfrac{35}{34}\)

d)\(\dfrac{6}{-11}=\dfrac{-6.5}{11.5}=-\dfrac{30}{55}\)