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 bên. Số nghiệm dương phân biệt của phương trình \(2f\left( x \right) + 7 = 0\) là![](data:image/png;base64,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)
A. 1
B. 4
C. 2
D. 3
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Trường THPT Chuyên Nguyễn Quang Diệu