39=39x99的简便算法bangbangmangya biyouzhongxie xixi

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39=39x99的简便算法bangbangmangyabiyouzhongxiexixi39=39x99的简便算法bangbangmangyabiyouzhongxiexixi39=39x99的简便算

39=39x99的简便算法bangbangmangya biyouzhongxie xixi
39=39x99的简便算法
bangbangmangya biyouzhongxie xixi

39=39x99的简便算法bangbangmangya biyouzhongxie xixi
39x99=(40-1)x(100-1)
=40x100-100-40+1
=4000-140+1
=3861

x=39*(100-1)
=3861

39*100-39

39x99=39x100-39
=3900-40+1
=3861

39x100-39x1
=3900-39
=3861

解 :39x99=39
99X=39÷39
99X=1
X=1/99