a: \(-\dfrac{1}{4}=-\dfrac{25}{100}=-0,25\)
b: \(-\dfrac{123}{369}=\dfrac{-123:123}{369:369}=\dfrac{-1}{3}\)
mà \(-\dfrac{1}{3}>-\dfrac{2}{3}\)
nên \(-\dfrac{2}{3}< -\dfrac{123}{369}\)
c:
Sửa đề: \(-\dfrac{212121}{313131};\dfrac{-2626}{3131}\)
\(-\dfrac{212121}{313131}=\dfrac{-212121:10101}{313131:10101}=\dfrac{-21}{31}\)
\(-\dfrac{2626}{3131}=\dfrac{-2626:101}{3131:101}=\dfrac{-26}{31}\)
mà -21>-26
nên \(-\dfrac{212121}{313131}>-\dfrac{2626}{3131}\)