Cho hàm số y = f(x) có bảng biến thiên như sau:
Câu hỏi: Cho hàm số y = f(x) có bảng biến thiên như sau:![](data:image/png;base64,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)
A. 4
B. 3
C. 2
D. 1
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 Trường THPT Kim Liên- Hà NộiA. 4
B. 3
C. 2
D. 1
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 Trường THPT Kim Liên- Hà Nội