乘法快速计算

066770×3 = 078208×5 = 030611×7 =
017480×5 = 082742×5 = 015886×3 =
058132×9 = 043588×4 = 097105×7 =
037938×7 = 031253×6 = 019132×6 =
057467×6 = 054336×6 = 029694×3 =
027697×5 = 095476×8 = 032565×3 =
060745×4 = 037564×3 = 094379×2 =
093438×2 = 032631×4 = 054768×9 =
2满5进1
3超3进1、超6进2
4满25进1、满5进2、满75进3
5进半
6超16进1、超3进2、满5进3、超6进4、超83进5
7超142857进1、超285714进2、超428571进3、超571428进4、超714285进5、超857142进6
8满125进1、满25进2、满375进3、满5进4、满625进5、满75进6、满875进7
9超几进几