Arrange the areas below in descending order. 50 hectares & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 5 square kilometers & nbsp; & nbsp; & nbsp; & nbsp; 550 square meters & nbsp; & nbsp; & nbsp; & nbsp; 5000 square decimeters___ ．

Arrange the areas below in descending order. 50 hectares & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 5 square kilometers & nbsp; & nbsp; & nbsp; & nbsp; 550 square meters & nbsp; & nbsp; & nbsp; & nbsp; 5000 square decimeters___ ．

50 hectares = 500000 square meters, 5 square kilometers = 5000000 square meters, 5000 square decimeters = 50 square meters, so 5 square kilometers > 50 hectares > 550 square meters > 50 square meters, so the answer is: 5 square kilometers > 50 hectares > 550 square meters > 50 square meters