Mathematics
Senior High
1:2n二乗+2n－2 2:6分の1n(2n二乗+3n+1)+1 3:4分の5n乗+11 4:－6×2のn－1乗+3 5:3×2分の1のn－1乗－2
全て間違っているような気がします。あっているか確認お願いします！
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