Question

5.249×1.28的積里有

5

位小數(shù)．

Answer 1

分析：由于在乘法算式5.249×1.28中，5.249有3位小數(shù)，1.28有2位小數(shù)，根據(jù)小數(shù)乘法的運算法則可知，5.249×1.28的積里有2+3=4位小數(shù)．

解答：解：根據(jù)小數(shù)乘法的運算法則可知，
5.249×1.28的積里有2+3=4位小數(shù)．
故答案為：5．

點評：小數(shù)乘法的法則：小數(shù)乘以整數(shù)，先按整數(shù)乘法法則算出積，再看被乘數(shù)有幾位小數(shù)，就從積的右邊起數(shù)出幾位，點上小數(shù)點．