Cho hàm số y = f(x) liên tục trên R và có đồ thị n...
Câu hỏi: Cho hàm số y = f(x) liên tục trên R và có đồ thị như hình vẽ. ![](data:image/png;base64,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)
A. 6
B. 8
C. 7
D. 9
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi THPT QG môn Toán năm 2019 Trường THPT Chuyên Hạ Long lần 1