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a≥b x²-x+1 b=x²+x a-b=(2x²-x+1)-(x²+x) a-bx²-x+1-x²-x a-b=x²-2x+1 a-b=(x-1)² 原因:(x-1)²≥0 したがって、a-b≥0 したがって:a≥b
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