Mathematics
Senior High
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赤マーカー部分の展開がなぜそのようになるか教えてください

(2) n-1 -4 ←2.3"+12+2 としても 1 ら an=2"{9 (2) 3\n-1 -4=6.3"-4.2" よい。 -2 の両辺を3+1で割ると 1/2 \n Jel
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