番号 名前 2013年6月11日提出
1. 形式的べき級数環 R[[x]] において、(1 +x)y= 1 をみたす y ∈R[[x]] を求めよ。
裏面の問題も解答すること。
2. 形式的べき級数環 R[[x]] において、
1 + 2x+ 3x2 1 +x における x3 の係数を求めよ。
全文
番号 名前 2013年6月11日提出
1. 形式的べき級数環 R[[x]] において、(1 +x)y= 1 をみたす y ∈R[[x]] を求めよ。
裏面の問題も解答すること。
2. 形式的べき級数環 R[[x]] において、
1 + 2x+ 3x2 1 +x における x3 の係数を求めよ。
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