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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 정말 간단하지만 아직 풀리지 않은 문제
Rupp1 2018.05.07 23:50 조회 961

X^{3}+Y^{3}+Z^{3}=33 에 정수해가 존재하는가?

이 문제 어떠셨나요?

글쎄요

0

어려워요

0

  •  
    화하학 Lv.1 2018.05.09 08:04

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    세제곱수를 8로 나눈 나머지는 0,1,3,4밖에 없죠

    (4k)3\equiv0 (mod 8)

    (4k+1)3\equiv1 (mod 8)

    (4k+2)3\equiv4 (mod 8)

    (4k+3)3\equiv3 (mod 8)

    33\equiv1(mod 8)이므로, X,Y,Z를 8로 나눈 나머지의 경우의 수를 알 수 있습니다.

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  •  
    화하학 Lv.1 2018.05.09 08:18

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    wlog

    경우의 수는 각각

    (1.0.0), (1.4.4), (3.3.3) 총 3가지이겠네요.

    1) 8로 나눈 나머지가 (3.3.3)일 때

    x3=(8a+3), y3=(8b+3), z3=(8c+3) 라 합시다.

    8(a+b+c)+9=33이라 하면, a+b+c=3입니다.

    이때 a,b,c가 짝수인지 홀수인지 판단해보면, (홀,홀,홀), (홀,짝,짝)입니다.

    1-1) (홀,홀,홀)

    a=2m+1, b=2n+1 c=2q+1이라 합시다.

    (m+n+q)=0입니다. 

    m+n=-q이므로, -16q=33이라는 결과가 나옵니다. z3은 -22라는 결과가 나오는데, 이는 조건과 어긋나죠

    1-2)

    같은 방법으로 합시다.

    대신에,

    a=2m+1, b=2n, c=2q+2라 합시다.

    이는 (m+n+q)를 0으로 맞추기 위해서입니다.

     

    나머지 경우에 대해서도 노가다합시다.

    그러면 해가 단 하나도 없다는 결론을 내릴 수 있습니다.

     

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  •  
    나.스테이 Lv.1 2018.07.12 08:58

    일단 양의정수에서만 보면 양의정수의 세제곱 중 33을 넘지 않는것은

    13      1

    23      8,

    33  27

    이어서 절대 33을 만들지 못하는데, 음의 정수는 세제곱하면 마이너스가 되니까..

    -13     -1

    -23      -8

    -33      -27

    -43 부터는 너무 커서 양의정수가 될수 없기 때문에 쓰지 않겠습니다.

    음의정수 양의정수들 더해서 나온값 중에 33이 있는지 모르겠네요ㅠㅠ

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  •  
    미래의 수학자 Lv.1 2018.10.20 07:49

    우선 세 수x,y,z중에 두 개의 수는 반드시 음수 일 수 밖에 없네요..

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