Question

8．4.02×0.17的積中有（　　）位小數(shù)．

• A． 二
• B． 三
• C． 四
• D． 五

Answer 1

分析 根據(jù)小數(shù)乘法的計(jì)算法則，先按照整數(shù)乘法的計(jì)算法則算出積，再看兩個(gè)因數(shù)一共有幾位小數(shù)就從積的右邊起數(shù)出幾位多少小數(shù)點(diǎn)．據(jù)此解答．

解答 解：由小數(shù)乘法的計(jì)算法則可知：積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)之和．4.02是兩位小數(shù)，0.17是兩位小數(shù)，所以積的小數(shù)尾數(shù)是2+2=4．
答：4.02×0.17的積中有四位小數(shù)．
故選：C．

點(diǎn)評(píng) 此題考查的目的是理解掌握小數(shù)乘法的計(jì)算法則．明確：積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)之和．