42÷3=
4.2÷3=
0.42÷3=
0.042÷3=
10.8÷15=
10.8÷150=
10.8÷1500=
10.8÷15000=
分析:根據(jù)商的變化規(guī)律,被除數(shù)不變,除數(shù)數(shù)擴(kuò)大(或縮小)幾倍(0除外),則商縮小(或擴(kuò)大)相同的倍數(shù);除數(shù)不變,被除數(shù)擴(kuò)大或縮小幾倍(0除外),則商也隨之?dāng)U大(或縮。┫嗤谋稊(shù);據(jù)此解答.
解答:解:42÷3=14,
4.2÷3=1.4,
0.42÷3=0.14,
0.042÷3=0.014;
10.8÷15=0.72,
10.8÷150=0.072,
10.8÷1500=0.0072,
10.8÷15000=0.00072;
故答案為:14,1.4,0.14,0.014,;0.72,0.072,0.0072,0.00072.
點評:此題考查了商的變化規(guī)律,熟記商的變化規(guī)律是解答此題的關(guān)鍵.
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