|   运算对象  |       计算方法  |       
  |       
  |       
  |       
  |       近似  |       减少量  |    
|   
  |       逐次计算  |       2  |       4  |       2  |       
  |       21.6  |       39.4%  |    
|   直接计算  |       1  |       3  |       2  |       6  |       13.08  |    ||
|   
  |       逐次计算  |       4  |       8  |       4  |       
  |       43.2  |       53.3%  |    
|   直接计算  |       1  |       8  |       4  |       12  |       20.16  |    ||
|   
  |       逐次计算  |       6  |       12  |       6  |       
  |       64.8  |       58.0%  |    
|   直接计算  |       1  |       13  |       6  |       18  |       27.24  |    ||
|   
  |       逐次计算  |       8  |       16  |       8  |       
  |       86.4  |       60.3%  |    
|   直接计算  |       1  |       18  |       8  |       24  |       34.32  |    ||
|   
  |       逐次计算  |       
  |       
  |       
  |       
  |       
  |       67.2%  |    
|   直接计算  |       1  |       
  |       
  |       
  |       
  |