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Câu hỏi: Cho $\int{f\left( x \right)\text{d}x}=F\left( x \right)+C$. Khẳng định nào sau đây đúng?
A. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=x-F\left( x \right)+C.$
B. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)+x+C.$
C. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)+1+C.$
D. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)-x+C.$
A. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=x-F\left( x \right)+C.$
B. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)+x+C.$
C. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)+1+C.$
D. $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)-x+C.$
Ta có: $\int{\left( f\left( x \right)+1 \right)\text{d}x}=F\left( x \right)+x+C.$
Đáp án B.