Cho hàm số \(y = f(x)\)có đồ thị như hình vẽ dưới...
Câu hỏi: Cho hàm số \(y = f(x)\)có đồ thị như hình vẽ dưới đây. Hàm số \(y = f(x)\)có bao nhiêu điểm cực tiểu?![](data:image/png;base64,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)
A 1
B 0
C 3
D 2
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán trường THPT Nguyễn Viết Xuân - Vĩnh Phúc - Lần 1 - Năm 2019 - Có lời giải chi tiết