Question

72.09×1.83的積有

 

位小數(shù)．3.6的一半是

 

．

Answer 1

分析：根據(jù)小數(shù)乘法的計算法則，先按照整數(shù)乘法的計算法則算出積，再看兩個因數(shù)一共有幾位小數(shù)，就從積的末尾數(shù)出幾位點上小數(shù)點．由此解答．3.6的一半就是求3.6÷2是多少．

解答：解：根據(jù)積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和，72.09×1.83，兩個因數(shù)一共有四位小數(shù)，那么積是四位小數(shù)；
3.6÷2=1.8；
故答案為：

點評：此題主要考查小數(shù)除法的意義，及在小數(shù)乘法中積的小數(shù)位數(shù)與兩個因數(shù)的小數(shù)位數(shù)之間的關系，積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和．