Cho hàm số \(y=f(x)\) liên tục trên R và có đồ thị...
Câu hỏi: Cho hàm số \(y=f(x)\) liên tục trên R và có đồ thị như hình vẽ bên.![](data:image/png;base64,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)
A. 3
B. 1
C. 4
D. 2
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Trường THPT Chuyên Nguyễn Quang Diệu