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[창의 퍼즐] [대수] 삼차방정식과 사차방정식

아엘 2020.07.13 02:31 조회 573

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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

x+1/x=-1일 때, 양의 정수 n에 대하여 P(n)을 P(n)=(x^2+x)^n+(x^2+1)^n+(x+1)^n이라고 하자(후...힘들군...). P(1)+P(2)+P(3)+.....+P(999)의 값을 구하시오

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아엘 Lv.7 2020.07.13 02:32 비밀댓글

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아인수타인 Lv.12 2020.07.13 03:51

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Function: mkdir

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Function: getLatexImg

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Function: view

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Function: file_put_contents

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Function: require_once

어... 수식 치는 방법 좀 알려드릴까요?

(좀 읽기가 힘듬...)

(저를 포함한 읽기 힘든 분들을 위해: $x+\frac{1}{x}=-1$ 일 때, $P(n)=(x^2+x)^n+(x^2+1)^n+(x+1)^n$ 입니다)

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