Mathematics
Senior High
和の中抜けなんですけど、この一般形ってどうやってこの答えになんですか
練習 3
次の文字式の一般形を求めよ。
□(1)
1
n(n + 1)
(3) n(n+1)
□(2)
1
n(n+1)(n+2)
(4) n(n+1)(n+2)
解答
(1)
a
n
a
(2)
(3) a(n - 1)n(n + 1)
n(n+1)…………………….
(4)a(n - 1)n(n + 1)(n+2)
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