Mathematics
Senior High

数IIです。
(1)と(2)の解き方を教えて頂きたいです🥲

21 [青チャート数学Ⅱ 練習12] 次の計算をせよ。 1 (1) + (x-1)x 2 (n − 2)n (2) + 1 1 x(x+1) (x+1)(x+2) 2 n(n+2) + + 2 (n+2)(n+4)

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