题目内容
38.2÷0.25=________÷25 9.12÷3.8=________÷38．
3820 91.2
分析：根据商不变的性质，除数0.25变成25扩大了100倍，要使商不变，被除数38.2也要扩大100倍；
除数3.8变成38扩大了10倍，要使商不变，被除数9.12也要扩大10倍；据此解答．
解答：38.2÷0.25，
=（38.2×100）÷（0.25×100），
=3820÷25；
9.12÷3.8，
=（9.12×10）÷（3.8×10），
=91.2÷38；
故答案为：3820，91.2．
点评：解答此题的关键是灵活应用商不变的性质，即被除数和除数同时扩大或缩小相同的倍数（0除外），商不变．
分析：根据商不变的性质，除数0.25变成25扩大了100倍，要使商不变，被除数38.2也要扩大100倍；
除数3.8变成38扩大了10倍，要使商不变，被除数9.12也要扩大10倍；据此解答．
解答：38.2÷0.25，
=（38.2×100）÷（0.25×100），
=3820÷25；
9.12÷3.8，
=（9.12×10）÷（3.8×10），
=91.2÷38；
故答案为：3820，91.2．
点评：解答此题的关键是灵活应用商不变的性质，即被除数和除数同时扩大或缩小相同的倍数（0除外），商不变．
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