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分情况 X2-4X +3=(x-2)的平方-1=(x-2-1)(x-2+1)=(x-3)(x-1),X2-6X+9=(x-3)(x-3) 當x=3,一樣大 當X大於3,X2-4X +3大 當X小於3,X2-4X +3小
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