Question

用豎式計(jì)算．
①28.08÷5.2=
②3.57×1.2=

Answer 1

分析：①根據(jù)小數(shù)除法法則：除數(shù)是小數(shù)的除法，先利用除法中除數(shù)與被除數(shù)同時(shí)擴(kuò)大或縮小相同的倍數(shù)商不變，去掉除數(shù)的小數(shù)點(diǎn)，然后再按整數(shù)除法計(jì)算，商的小數(shù)點(diǎn)與被除數(shù)的小數(shù)點(diǎn)對(duì)齊，直接進(jìn)行計(jì)算．
②根據(jù)小數(shù)乘法法則：先按照整數(shù)乘法法則算出積，再看因數(shù)中一共有幾位小數(shù)，就從積的右邊向左數(shù)出幾位，點(diǎn)上小數(shù)點(diǎn)，直接進(jìn)行計(jì)算．

解答：解：①28.08÷5.2=5.4

 ②3.57×1.2=4.284
   

點(diǎn)評(píng)：考查了小數(shù)乘、除法法則的掌握應(yīng)用情況．