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    January 24

    难题征解(二)

    一,  在实数范围内找关于连续函数f(x)+f(2x)+f(3x)=0的所有非零解
     
     
    二,  三队足球队进行了循环赛。A胜B,B胜C,C胜A,知所有队的入球总数少于40(也许多了点,不过也有可能)。A队取得最多入球;B队的净胜球(得球减失球)最大;C队的得失球比(得球除以失球)最高。
    当裁判还在商议冠军谁属时,你能算出各场比赛的战果吗?
     
    三,  5*5方格排列的每个房间都有一盏灯,当开或关某一个房间的灯时都会使与之接壤(十字型)的4个房间的灯的状态改变.
    若初始状态为所有灯都关闭
    问1)最少需要多少次开关灯能使所有的灯都亮?

      2)具体步骤?
    这类问题是否应用拓朴的方法解?
     
     
    四, 有100(1白99黑,这99根黑线完全相同)根电线通在一到二十楼间,
    给你一些相同的电阻和一个万用表,请你用最少数量的电阻,楼上楼下只跑一趟,把这些黑线分别标出两头。
     
     
    五,  某数列的前六项为1,0,1,0,1,0,以后每项为前6项数字的和的个位数字
    证明:
    这数列后来不会有…0,1,0,1,0,1…的情况出现。
     

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