問題詳情
7. 以下敘述何者正確？
(A) 當 
的圖形有最低點，最低點坐標為(0, a)
(B) 二次函數 
的值必大於-5
(C) 所有正角錐的側面都是正三角形
(D) 我們可以用判別式b2-4ac 是正數、負數或0 來判別二次函數 
與 x軸的交點個數
參考答案
答案：D
難度：非常簡單1
統計：A(0),B(0),C(0),D(1),E(0)
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