用简便方法计算4.9÷0.125  3.6

用简便方法计算4.9÷0.125  3.6÷0.18÷20  0.8÷0.32.
2024-11-09 05:44:33
推荐回答(1个)
回答1:

①4.9÷0.125
=(4.9×8)÷(0.125×8)
=39.2÷1
=39.2
  
②3.6÷0.18÷20
=20×0.18÷0.18÷20
=(0.18÷0.18)×(20÷20)
=1×1
=1  

③0.8÷0.32
=0.8÷(0.8×0.4)
=0.8÷0.8÷0.4
=1÷0.4
=2.5