Question

3．1.35×0.07的積有四位小數(shù)．

Answer 1

分析 因?yàn)閮蓚�(gè)小數(shù)末尾5×7=35，根據(jù)小數(shù)乘法的計(jì)算法則：看兩個(gè)因數(shù)一共有幾位小數(shù)，就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．據(jù)此解答．

解答 解：因?yàn)閮蓚�(gè)小數(shù)末尾5×7=35，根據(jù)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)的和，
算式1.35×0.07，兩個(gè)因數(shù)中共有四位小數(shù)，所以1.35×0.07的積有四位小數(shù)．
故答案為：四．

點(diǎn)評(píng) 此題考查的目的是掌握小數(shù)乘法的計(jì)算法則，小數(shù)末尾兩個(gè)數(shù)的乘積不等于0，那么積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的和．