Question

2.78×1.06，它的積是四位小數(shù)．

Answer 1

正確
分析：根據(jù)小數(shù)乘法的計算法則，先按照整數(shù)乘法的計算法則算出積，再看兩個因數(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：根據(jù)積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和，2.78×1.06，兩個因數(shù)一共有四位小數(shù)，那么積是四位小數(shù)；
所以2.78×1.06，它的積是四位小數(shù)．正確
故答案為：正確．
點(diǎn)評：此題主要考查在小數(shù)乘法中積的小數(shù)位數(shù)與兩個因數(shù)的小數(shù)位數(shù)之間的關(guān)系，積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和．