5.4x19.9 0.54的简便方法

5.4x19.9+0.54=5.4x19.9+5.4x0.1=5.4x(19.9+0.1)=5.4x20=108

=5.4x19.9+5.4x0.1=5.4x(19.9+0.1)=5.4x20=108

54=5.4*19.1=55.4*19.4*(19.9+0.9+0.4*0.9+5

解:原式=0.54*199+0.54*1=0.54*(199+1)=0.54*200=108

5.4X19.9十0.54==5.4x(19.9+0..1)=5.4X20=108

=5.4*29.9+5.4*0.1=5.4*(29.9+0.1)=5.4*30=162 再看看别人怎么说的.

=0.54x199+0.54=0.54x(199+1)=0.54x200=108

5.4*19.9*0.54=5.4*5.4*1.99=5.4*5.4*(2-0.01)=58.32-0.2916=58.0284

54x19.9十0.54=54x19.9十54x0.01=54x19.91=1075.14

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