Mathematics
Senior High

緑の線から2個目の緑の線の計算がどうなってるか教えてほしいです

9 条件まり ローニーゲ十み [Z。) の階差数列の第 ヵ 項が ゲがであるから,ヵ=2 のとき ぇー1 =a+記(がの=e+記だ+品4 =21す(のー1)x2z0+信(Da に

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