(6.4+6.4+6.4+6.4)*0.25简便算法

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(6.4+6.4+6.4+6.4)*0.25简便算法
(6.4+6.4+6.4+6.4)*0.25简便算法

(6.4+6.4+6.4+6.4)*0.25简便算法
(6.4+6.4+6.4+6.4)*0.25
=6.4×4×0.25
=6.4×1
=6.4

6.4*4*1/4=6.4

(6.4+6.4+6.4+6.4)*0.25
=6.4*4*0.25
=6.4*(4*0.25)=6.4*1=6.4