Cho hàm số liên tục trên và có đồ thị như hình vẽ bên. Hình phẳng được đánh dấu trong hình vẽ bên có diện tích là
![](data:image/png;base64,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)
A.
.
B.
.
C.
.
D.
.
Đáp án và lời giải
Đáp án:A
Lời giải:
Hướng dẫn giải
Chọn A
Ta có và nên diện tích của hình phẳng là