Cho hàm số y = f(x). Biết rằng hàm số f(x) có đạo...
Câu hỏi: Cho hàm số y = f(x). Biết rằng hàm số f(x) có đạo hàm là f'(x) và hàm số y = f'(x) có đồ thị như hình vẽ bên. Khẳng định nào sau đây sai?![](data:image/png;base64,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)
A. Hàm f(x) nghịch biến trên khoảng \(\left( { - \infty ; - 2} \right).\)
B. Hàm f(x) nghịch biến trên khoảng \(\left( {1; + \infty } \right)\)
C. Trên (-1; 1) thì hàm số f(x) luôn tăng
D. Hàm f(x) giảm trên đoạn có độ dài bằng 2
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 Trường THPT Trần Hưng Đạo