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1 .-x²;+6x-9-1=-(x-3)²;-1∵(x-3)²;必大於0推得-(x-3)²;必小於0即-x²;+6x-9-1=-(x-3)²;-1恒小於02.4x²;-12x+10=4x²;-12x+9+1=(2x-3)²;+1即恒大於0…
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