Question

so sánh  

a )3/124 ; 1/41 ; 5/207 ;2/84

b) 163 / 257 ; 163/221; 149/257

c) -15/18;-17/20;-21/24

giúp mk nhé

Answer 1

b: \(\dfrac{163}{257}< \dfrac{163}{221}\)

mà 149/257<163/257

nên 149/257<163/257<163/221

c: \(\dfrac{15}{18}=\dfrac{5}{6}=\dfrac{100}{120}\)

\(\dfrac{17}{20}=\dfrac{102}{120}\)

\(\dfrac{21}{24}=\dfrac{105}{120}\)

mà 100<102<105

nên 15/18<17/20<21/24

=>-15/17>-17/20>-21/24