Cho hàm số \(y = a{x^2} + bx + c\) có đồ thị là pa...
Câu hỏi: Cho hàm số \(y = a{x^2} + bx + c\) có đồ thị là parabol (P) như hình vẽ bên. Các mệnh đề sau, mệnh đề nào đúng?![](data:image/png;base64,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)
A \(a > 0,b > 0\) và \(c > 0\).
B \(a < 0,b < 0\) và \(c > 0\).
C \(a > 0,b > 0\) và \(c < 0\).
D \(a > 0,b < 0\) và \(c > 0\).
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi HK1 môn Toán lớp 10 Trường THPT Nông Cống 3 - Thanh Hóa - Năm 2017 - 2018 (có lời giải chi tiết)