分析:在除法算式中,被除数和除数同时扩大或缩小相同的倍数(0除外),商不变;据此解答即可.
解答:解:根据商不变的性质可知,
76.8÷0.5=768÷5;
0.54÷0.18=54÷18;
5.28÷1.2=52.8÷12;
542.5÷17.5=5425÷175;
0.72÷0.8=7.2÷8;
0.672÷4.2=6.72÷42.
故答案为:768,54,18,52.8,12,5425,175,7.2,6.72,42.
点评:解答此题应明确:只有被除数和除数同时扩大或缩小相同的倍数(0除外),商才不变.