Question

Answer 1

\(\left|y\right|=\dfrac{1}{2}\\ =>\left[{}\begin{matrix}y=\dfrac{1}{2}\\y=-\dfrac{1}{2}\end{matrix}\right.\)

\(o\) Với \(y=\dfrac{1}{2}\)

\(=>A=\dfrac{1}{4}-\dfrac{1}{2}=\dfrac{1}{4}-\dfrac{2}{4}=-\dfrac{1}{4}\)

\(o\) Với \(y=-\dfrac{1}{2}\)

\(=>A=\dfrac{1}{4}-\left(-\dfrac{1}{2}\right)=\dfrac{1}{4}+\dfrac{1}{2}=\dfrac{1}{4}+\dfrac{2}{4}=\dfrac{3}{4}\)