Ответ:

  1. \(3\,001\,257<3\,010\,256\);
  2. \(2{,}57>1{,}837\);
  3. \(0{,}0005<0{,}003\);
  4. \(0{,}94>0{,}495\);
  5. \(\frac8{17}<2\frac1{17}\);
  6. \(\frac{12}{25}>\frac9{25}\).