Mathematics
Senior High
3行目のかっこの中の式がどうしてこうなるのかわかりません。このような公式などあるのですか?教えてください!!
6)和9は初項2” 、公大(、項数2の
符彦教釣 2初でろるか5
=の27チ2.27な27し
=2727テ2デーロリ
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