Question

SO SÁNH CÁC SỐ HỮU TỈ SAU:

a/\(\dfrac{325}{260}\)và\(\dfrac{876}{320}\)

b/\(\dfrac{13}{9}\)và\(\dfrac{8}{3}\)

c/\(\dfrac{18}{-39}\)và\(\dfrac{-17}{41}\)

d/\(\dfrac{-15}{25}\)và\(\dfrac{-151515}{232323}\)

Answer 1

a) Ta có: \(\dfrac{325}{260}< 2< \dfrac{876}{320}\) => \(\dfrac{325}{260}< \dfrac{876}{320}\)

b) Ta có: \(\dfrac{13}{9}< \dfrac{24}{9}=\dfrac{8}{3}\) => \(\dfrac{13}{9}< \dfrac{8}{3}\)

c) Ta có: \(\dfrac{18}{-39}=\dfrac{-18}{39}< \dfrac{-17}{39}< \dfrac{-17}{41}\) => \(\dfrac{18}{-39}< \dfrac{-17}{41}\)

d) Ta có: \(\dfrac{-151515}{232323}=\dfrac{-151515\div10101}{232323\div10101}=\dfrac{-15}{23}\)

Mà \(\dfrac{-15}{25}>\dfrac{-15}{23}\) => \(\dfrac{-15}{25}>\dfrac{-151515}{232323}\)

Answer 2

a) \(\dfrac{325}{260}=\dfrac{5}{4}=\dfrac{100}{80}< \dfrac{219}{80}=\dfrac{876}{320}\)

b) \(\dfrac{13}{9}< \dfrac{24}{9}=\dfrac{8}{3}\)

c) \(\dfrac{18}{-39}=\dfrac{-738}{1599}< \dfrac{-663}{1599}=\dfrac{-17}{41}\)

d) \(\dfrac{-15}{25}=\dfrac{-151515}{252525}< \dfrac{-151515}{232323}\)