Question

用豎式計(jì)算小數(shù)乘法，兩個(gè)因數(shù)的小數(shù)點(diǎn)必須對(duì)齊．

×

．（判斷對(duì)錯(cuò)）

Answer 1

分析：計(jì)算小數(shù)乘法，先按照整數(shù)乘法的法則算出積，再看乘數(shù)中一共有幾位小數(shù)，就從積的右邊起數(shù)出幾位，點(diǎn)上小數(shù)點(diǎn)，不需要把兩個(gè)因數(shù)的小數(shù)點(diǎn)對(duì)齊，只要把這兩個(gè)小數(shù)的末尾數(shù)對(duì)齊，然后再進(jìn)一步解答．

解答：解：計(jì)算小數(shù)乘法，不需要把兩個(gè)因數(shù)的小數(shù)點(diǎn)對(duì)齊，只要把這兩個(gè)小數(shù)的末尾數(shù)對(duì)齊；
所以，用豎式計(jì)算小數(shù)乘法，兩個(gè)因數(shù)的小數(shù)點(diǎn)必須對(duì)齊是錯(cuò)誤的．
故答案為：×．

點(diǎn)評(píng)：小數(shù)乘法，按照整數(shù)乘法算出積，再看因數(shù)中一共有幾位小數(shù)，就從積的右邊起，向左數(shù)出幾位，點(diǎn)上小數(shù)點(diǎn)，因此，只要把這兩個(gè)小數(shù)的末尾數(shù)對(duì)齊．