成都三本大学排名:脑算乘法第86讲

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脑算乘法第86讲

(2010-02-18 19:13:33)转载 标签:

教育

脑算乘法第86讲                               参看“脑算”p76-31

一零几,乘一零零几,分乘相加                                   

 107×1008=107×1000+107×        109×1006=109×1000+109×6

          =107856                         =109654

一零几或一零零几乘九几或九九几,分乘相减                       参看“脑算”p77-32

108×97=108×100-108               1007×996=1007×1000-1007×4

       =10800-324                       =1007000-4028

       =10476                           =1002972