Cho hàm số \(y = a{x^3} + b{x^2} + cx + d\) có đồ...
Câu hỏi: Cho hàm số \(y = a{x^3} + b{x^2} + cx + d\) có đồ thị như hình vẽ bên. Mệnh đề nào dưới đây là đúng?![](data:image/png;base64,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)
A. ab<0,bc>0,cd>0.
B. ab<0,bc>0,cd<0.
C. ab>0,bc>0,cd<0.
D. ab<0,bc<0,cd<0.
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi giữa học kì 1 Toán 12 THPT Việt Đức Hà Nội năm học 2017 - 2018