Cho hàm số f(x) có bảng biến thiên như sau:
Câu hỏi: Cho hàm số f(x) có bảng biến thiên như sau:![](data:image/png;base64,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)
A. \(\left( { - \infty ; - 2} \right)\)
B. \(\left( {0; + \infty } \right)\)
C. (-2; 0)
D. \(\left( { - \infty ; 3} \right)\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi HK2 môn Toán 12 Trường THPT Phạm Công Bình - Vĩnh Phúc năm học 2017 - 2018