Question

4．0.35×3.73的積有4位小數(shù)，A×4.6的積是三位小數(shù)，那么A至少有兩位小數(shù)．

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)出幾位點(diǎn)上小數(shù)點(diǎn)．積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的之和．由此解答．

解答 解：根據(jù)分析知：0.35×3.73的積有2+2=4位小數(shù)，A×4.6的積是三位小數(shù)，那么A至少有兩位小數(shù)．
故答案為：4；兩．

點(diǎn)評(píng) 考查了小數(shù)乘法，關(guān)鍵是熟悉小數(shù)乘法中積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的之和的知識(shí)點(diǎn)．