Cho hàm số y = f ( x ) liên tục trên ℝ và 0 < a < b < c . Chọn mệnh đề sai. ∫ a c f ( x ) d x = &#

{\displaystyle \underset{a}{\overset{c}{\int }}f\left(x\right)\text{d}x}={\displaystyle \underset{a}{\overset{b}{\int }}f\left(x\right)\text{d}x}+{\displaystyle \underset{b}{\overset{c}{\int }}f\left(x\right)\text{d}x}..

${\displaystyle \underset{a}{\overset{a}{\int }}f\left(x\right)\text{d}x}=1$.

{\displaystyle \underset{a}{\overset{b}{\int }}cf\left(x\right)\text{d}x}=c{\displaystyle \underset{a}{\overset{b}{\int }}f\left(x\right)\text{d}x}.

${\displaystyle \underset{a}{\overset{b}{\int }}f\left(x\right)\text{d}x}=-{\displaystyle \underset{b}{\overset{a}{\int }}f\left(x\right)\text{d}x}$.