Tìm khoảng đồng biến của hàm số \(f(x)\) biết nó c...
Câu hỏi: Tìm khoảng đồng biến của hàm số \(f(x)\) biết nó có bảng biến thiên như hình bên.![](data:image/png;base64,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)
A. (0;1)
B. (- 1;3)
C. \(( - \infty ;0)\)
D. \((0; + \infty )\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Trường THPT Tôn Đức Thắng