Question

0.721×2.3的積是四位小數(shù)．

 

．（判斷對(duì)錯(cuò)）

Answer 1

考點(diǎn)：小數(shù)乘法

專題：運(yùn)算順序及法則

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)，就從積的末尾數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．由此解答．

解答： 解：根據(jù)積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的和，0.721×2.3，兩個(gè)因數(shù)一共有3+1=4位小數(shù)，那么積是四位小數(shù)；
所以0.721×2.3的積是四位小數(shù)是正確的．
故答案為：√．

點(diǎn)評(píng)：此題主要考查在小數(shù)乘法中積的小數(shù)位數(shù)與兩個(gè)因數(shù)的小數(shù)位數(shù)之間的關(guān)系，積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的和．