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6. 假設a,b是整數,且b≠0 。已知 是實係數一元二次方程式x2+kx+1=0的一個解。請問下列哪些選項是正確的?(A) 是上述方程式的另外一個解(B) (C) (D)k 一定是整數(E)a一定
問題詳情
6. 假設a,b是整數,且b≠0 。已知
是實係數一元二次方程式x2+kx+1=0的一個解。請問下列哪些選項是正確的?
(A)
是上述方程式的另外一個解
(B)
(C)
(D)k 一定是整數
(E)a一定是奇數
參考答案
答案:A,B,E
難度:
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4. 試問在坐標平面上,下列有關拋物線的敘述哪些是正確的?(A) 能夠找到拋物線以x軸為準線,x+y=0為對稱軸。(B) 能夠找到拋物線以x軸為準線,頂點是(1,1),焦點是(1,2)。(C) 能夠找
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