\(\dfrac{456}{461}\) và \(\dfrac{123}{128}\)
Ta có:
\(1-\dfrac{456}{461}=\dfrac{5}{461}\)
\(1-\dfrac{123}{128}=\dfrac{5}{128}\)
Mà \(\dfrac{5}{461}\) < \(\dfrac{5}{128}\) nên \(\dfrac{456}{461}\) > \(\dfrac{123}{128}\)
Ta có:456/461=1-5/461
123/128=1-5/128
Vì 5/461<5/128
=>1-5/461>1-5/128
Vậy 456/461>123/128