反贪风暴2 bt:脑算乘法第81讲

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脑算乘法第81讲

(2010-02-12 07:41:01)转载 标签:

教育

脑算乘法第81讲                          参看“简捷速算”p18-58

任意三位数平方,逐位自乘连起来,再加上逐位分别相乘的二倍,掌握好定位法。

348×348=121104                                     

091664    3×34×48×                          

+24   3×4×                               

 +48   3×8×                                                                                             

  +64   4×8×2

121104