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    January 24

    难题征解(三)

    一,  把1到100000000(一亿)写成一行,然后把所有的数字加起来,和是多少?
    如果嫌上面的太简单了,就做以下的。
    把1到100000000(一亿)写成一行,平方后再把所有的数学加起来,和是多少?

     

     

    二,  如何将一个正三角形分成四份,然后将它拼成一个正方形

     

     

       三,  在8*8的方格棋盘,至少要放置多少匹马,才能使:
    (1)所有的方格,包括马所占据的方格,都能被至少一匹马一次进攻到?
    (2)所有的方格,但不包括马所占据的方格,都能被至少一匹马一次进攻到?
    如何放置?

     

       

       四,  已知:a1,a2.....an均是有理数,√a1,√a2.......√an均是无理数,
    证明或否定:
    √a1+√a2+.......+√an是否一定是无理数?

     

    五,    证明或否定:三条直线可以七等分圆的面积

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