Cho hàm số y=f(x) có bảng biến thiên như hình bên....
Câu hỏi: Cho hàm số y=f(x) có bảng biến thiên như hình bên. Phát biểu nào sau đây là đúng ?![](data:image/png;base64,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)
A. Hàm số có 3 cực trị.
B. Hàm số đạt cực đại tại x=1
C. Giá trị cực tiểu của hàm số là -1
D. Hàm số đạt cực tiểu tại x=1
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPTQG năm 2018 môn Toán Chuyên ĐH Sư Phạm Hà Nội