Question

So sánh:

a) \(\dfrac{-9}{4}\) và \(\dfrac{1}{3}\).

b) \(\dfrac{-8}{3}\)  và \(\dfrac{4}{-7}\).

c) \(\dfrac{9}{-5}\) và \(\dfrac{7}{-10}\).

Answer 1

em trả lời ccaua này hi vọng thầy còn nhớ em

a) -9/4<`1/3

 

Answer 2

c) 9/-5<7/-10

Answer 3

a) \(\dfrac{-9}{4}< 0\)

\(0< \dfrac{1}{3}\)

Do đó: \(\dfrac{-9}{4}< \dfrac{1}{3}\)

Answer 4

b) \(\dfrac{-8}{3}=\dfrac{-8\cdot7}{3\cdot7}=\dfrac{-56}{21}\)

\(\dfrac{4}{-7}=\dfrac{-4}{7}=\dfrac{-4\cdot3}{7\cdot3}=\dfrac{-12}{21}\)

mà -56<-12

nên \(\dfrac{-8}{3}< \dfrac{4}{-7}\)

Answer 5

c) \(\dfrac{9}{-5}=\dfrac{-9}{5}=\dfrac{-9\cdot2}{5\cdot2}=\dfrac{-18}{10}\)

\(\dfrac{7}{-10}=\dfrac{-7}{10}\)

mà -18<-7

nên \(\dfrac{9}{-5}< \dfrac{7}{-10}\)