問題詳情
1. 設 f(x)=2x3-6x2-18x+3，則下列何者正確？
(A) f( x ) 在 x =1處有反曲點
(B) f (3) 為極小值
(C) f (x ) 在開區間( -1,3) 的圖形為遞減
(D) f (x ) 在開區間(1,3)的圖形為凹口向上
(E) f ( x) 在開區間( -1,1) 的圖形為凹口向上。
(A) f( x ) 在 x =1處有反曲點
(B) f (3) 為極小值
(C) f (x ) 在開區間( -1,3) 的圖形為遞減
(D) f (x ) 在開區間(1,3)的圖形為凹口向上
(E) f ( x) 在開區間( -1,1) 的圖形為凹口向上。
參考答案
答案：A,B,C,D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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