脱式计算与简便运算
=　                              =　            
=　   　                   =　       
6﹣×﹣=　                                  〔1﹣（﹣）〕÷=　     　
=　                              =　          
5+3.6×2.5÷0.48=　   　                        =　              
=　                           =　     　
3.6×2÷16.9÷（3×1.1 6）×1.3=　            +++…+=　     　．