简便计算7.2乘以9.急.

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简便计算7.2乘以9.急.简便计算7.2乘以9.急.简便计算7.2乘以9.急.7.2乘以9.9=7.2*(10-0.1)=72-0.72=71.287.2乘以9.9=7.2*(10-0.1)=72-0

简便计算7.2乘以9.急.
简便计算7.2乘以9.
急.

简便计算7.2乘以9.急.
7.2乘以9.9
=7.2*(10-0.1)
=72-0.72
=71.28

7.2乘以9.9
=7.2*(10-0.1)
=72-0.72
=71.28
9.9+0.1=10那么就用10-0.1再*7.2.