4.9+0.1-4.9+0.1简便法

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4.9+0.1-4.9+0.1简便法4.9+0.1-4.9+0.1简便法4.9+0.1-4.9+0.1简便法4.9+0.1-4.9+0.1=4.9-4.9+0.1+0.1=0.1*2=0.24.9+0

4.9+0.1-4.9+0.1简便法
4.9+0.1-4.9+0.1简便法

4.9+0.1-4.9+0.1简便法
4.9+0.1-4.9+0.1
=4.9-4.9+0.1+0.1
=0.1*2
=0.2

4.9+0.1-4.9+0.1
=4.9-4.9+0.1+0.1
=0+0.2
=0.2

=(4.9-4.9)+(0.1+0.1)=0+0.2=0.2

4.9+0.1-4.9+0.1
=4.9-4.9+0.1+0.1
=0+0.2
=0.2

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