Question

兩個因數(shù)的小數(shù)位數(shù)的和是4，積的小數(shù)位數(shù)也一定是4．

錯誤

．（判斷對錯）

Answer 1

分析：根據(jù)題意，假設(shè)這兩個小數(shù)分別是0.25和0.04，根據(jù)小數(shù)乘法的計算方法計算出乘積，然后再進一步解答即可．

解答：解：根據(jù)題意，假設(shè)這兩個小數(shù)分別是0.25和0.04．
0.25×0.04=0.01；它們的乘積0.01的小數(shù)位數(shù)是兩位小數(shù)；
因此，兩個因數(shù)的小數(shù)位數(shù)的和是4，積的小數(shù)位數(shù)也一定是4是錯誤的．
故答案為：錯誤．

點評：根據(jù)題意，用賦值法能比較快速準確的判斷此題．