精英家教網 > 小學數學 > 題目詳情
1.5÷0.4=3…0.3．
正確
分析：在計算有余數的除法時，往往根據商不變的規(guī)律把對應被除數與除數縮小或擴大相同的倍數，商不變，但余數相對應的縮小或擴大對應的倍數，要想得到原來的余數，只要對應擴大或縮小相同的倍數即可，由此規(guī)律解答即可．
解答：把1.5÷0.4變?yōu)?5÷4=3…3，
商相同，余數對應擴大10倍，原式的余數為3÷10=0.3；
故答案為：正確．
點評：此題主要利用有余數的除法中，被除數與除數縮小或擴大相同的倍數，商不變，余數相對應的縮小或擴大對應的倍數，掌握這一規(guī)律，靈活解答問題．
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