\(\left( { - 13} \right).\left( { - 47} \right)\) với \(\left( { - 39} \right).6\)
Ta có: \(\left( { - 13} \right).\left( { - 47} \right)\,\,\, > \,\,\,0\) ;\(\left( { - 39} \right).6\,\,\, < \,\,\,0\)
Vậy \(\left( { - 13} \right).\left( { - 47} \right)\) \( > \)\(\left( { - 39} \right).6\)