Question

用豎式計算
7.15×22        
90.75÷3.3              
3.68×0.25．

Answer 1

分析：利用小數(shù)乘法和小數(shù)除法計算法則計算即可．

解答：解：7.15×22=157.3；                     
      

7． 15 × 22

14   30

                     
     

143  0

157. 30

                        
                                                                              
 90.75÷3.3=27.5；
          27.5
     33

907.5

       

66

247

       

231

165

        

165

0

 
3.68×0.25=0.92；
     

3． 68 ×0． 25

18 40 73 6 0.92  00

點評：計算小數(shù)乘法，關(guān)鍵是看因數(shù)里面一共有幾位小數(shù)，就從積的末尾向左數(shù)出幾位點上小數(shù)點．計算小數(shù)除法，關(guān)鍵是要把除數(shù)轉(zhuǎn)化成整數(shù)，商的小數(shù)點要和被除數(shù)的小數(shù)點對齊．