2×(-1/2)³－3×(-1/2)²＋3×(-1/2)－1
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2×(-1/2)³－3×(-1/2)²＋3×(-1/2)－12×(-1/2)³－3×(-1/2)²＋3×(-1/2)－12×(-1/2)³－3×(-1
2×(-1/2)³－3×(-1/2)²＋3×(-1/2)－1
2×(-1/2)³－3×(-1/2)²＋3×(-1/2)－1
2×(-1/2)³－3×(-1/2)²＋3×(-1/2)－1
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2×(-1/2)³－3×(-1/2)²＋3×(-1/2)－1
=-1/4-3/4-3/2-1
=-1-3/2-1
=-7/2