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. 3
B. 4
C. 1
D. 2
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 Trường THPT Hàm Rồng - Thanh HóaA. 3
B. 4
C. 1
D. 2
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 Trường THPT Hàm Rồng - Thanh Hóa