Question

[°𝗝𝗲𝘆シ︎°]

B1: So sánh

a.\(\dfrac{-1}{20}\) và \(\dfrac{5}{7}\)

b. \(\dfrac{216}{217}\) và \(\dfrac{1164}{1163}\)

c. \(\dfrac{-12}{17}\)  và \(\dfrac{-14}{15}\)

d. \(\dfrac{27}{29}\) và \(\dfrac{-2727}{2929}\)

e. \(\dfrac{3}{-4}\) và \(\dfrac{1}{2}\) 

f. \(\dfrac{125}{-126}\) và \(\dfrac{1440}{1439}\)

g. \(\dfrac{-22}{66}\) và \(\dfrac{25}{-76}\)

h. \(\dfrac{-15}{91}\) và \(\dfrac{-23}{138}\)

_Gấp ạ:<<_

Answer 1

[Nguyễn Lê Phước Thịnh]

a) \(\dfrac{-1}{20}=\dfrac{-7}{140}\)

\(\dfrac{5}{7}=\dfrac{100}{140}\)

mà -7<100

nên \(-\dfrac{1}{20}< \dfrac{5}{7}\)

b) \(\dfrac{216}{217}< 1\)

\(1< \dfrac{1164}{1163}\)

nên \(\dfrac{216}{217}< \dfrac{1164}{1163}\)

c) \(\dfrac{-12}{17}=\dfrac{-180}{255}\)

\(\dfrac{-14}{15}=\dfrac{-238}{255}\)

mà -180>-238

nên \(-\dfrac{12}{17}>\dfrac{-14}{15}\)

d) \(\dfrac{27}{29}>0\)

\(0>-\dfrac{2727}{2929}\)

nên \(\dfrac{27}{29}>-\dfrac{2727}{2929}\)