Question

計(jì)算小數(shù)加、減法時(shí)，下面說法錯(cuò)誤的是（　　）

• A、末位對(duì)齊
• B、從低位算起
• C、得數(shù)的小數(shù)部分末尾有0，一般要把0去掉．

Answer 1

分析：計(jì)算小數(shù)加、減法時(shí)，要把相同數(shù)位對(duì)齊，也就是把小數(shù)點(diǎn)對(duì)齊．反過來說，小數(shù)點(diǎn)對(duì)齊了，相同數(shù)位也就對(duì)齊了．據(jù)此判斷．

解答：解：A、末位對(duì)齊，當(dāng)小數(shù)位數(shù)不一樣時(shí)，小數(shù)的末位對(duì)齊，小數(shù)點(diǎn)就對(duì)不齊，也就是相同數(shù)位沒有對(duì)齊；所以是錯(cuò)誤的．
B、從低位算起，說法正確．
C、得數(shù)的小數(shù)部分末尾有0，一般要把0去掉；說法正確．
故選：A．

點(diǎn)評(píng)：此題考查小數(shù)的加減法，重點(diǎn)是小數(shù)點(diǎn)對(duì)齊．