Question

Tìm giá trị nhỏ nhất : A = I\(|x-\dfrac{3}{4}|\)

Answer 1

\(A=\left|x-\dfrac{3}{4}\right|\ge0\)

Dấu " = " khi \(\left|x-\dfrac{3}{4}\right|=0\Rightarrow x=\dfrac{3}{4}\)

Vậy \(MIN_A=0\) khi \(x=\dfrac{3}{4}\)

Answer 2

\(A=I\left|x-\dfrac{3}{4}\right|\)

\(\left|x-\dfrac{3}{4}\right|\ge0\)

\(MIN_A\Leftrightarrow MIN_{\left|x-\dfrac{3}{4}\right|}\)

\(MIN_{\left|x-\dfrac{3}{4}\right|}=0\)

\(MIN_A=I.0=0\)