Cho hàm số \(y=f(x)\) xác định và liên tục trên R,...
Câu hỏi: Cho hàm số \(y=f(x)\) xác định và liên tục trên R, có đạo hàm \(f'(x)\). Biết rằng đồ thị hàm số \(f'(x)\) như hình vẽ. Xác định điểm cực đại của hàm số \(g(x)=f(x)+x\).![](data:image/png;base64,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)
A. Không có giá trị
B. x = 0
C. x = 1
D. x = 2
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Trường THPT Chuyên Bắc Ninh lần 3