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Câu hỏi: Diện tích phần gạch chéo trong hình bên được tính theo công thức
A. $\int\limits_{a}^{0}{f\left( x \right)\text{d}x}-\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
B. $-\int\limits_{a}^{0}{f\left( x \right)\text{d}x}+\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
C. $-\int\limits_{a}^{0}{f\left( x \right)\text{d}x}-\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
D. $\int\limits_{a}^{0}{f\left( x \right)\text{d}x}+\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
B. $-\int\limits_{a}^{0}{f\left( x \right)\text{d}x}+\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
C. $-\int\limits_{a}^{0}{f\left( x \right)\text{d}x}-\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
D. $\int\limits_{a}^{0}{f\left( x \right)\text{d}x}+\int\limits_{0}^{b}{f\left( x \right)\text{d}x}$.
Lý thuyết.
Đáp án B.