\(\left( { - 213} \right).\left( { - 345} \right)\) với \( - \,462\)
Ta có : \(\left( { - 213} \right).\left( { - 345} \right)\) \( > \) \(0\) ; \( - \,462\) \( < \) \(0\)
Suy ra : \(\left( { - 213} \right).\left( { - 345} \right)\) \( > \) \( - \,462\)