Question

A=/x-3,5/+0,5

Answer 1

Ta có : \(\left|x-3.5\right|\ge0\forall x\)

\(\Rightarrow\left|x-3.5\right|+0.5\ge0.5\forall x\)

Vậy \(Min_A=0.5\) khi \(x-3.5=0\Rightarrow x=3.5\)

Answer 2

\(A=\left|x-3,5\right|-0,5\)

\(\left|x-3,5\right|\ge0\forall x\)

\(A=\left|x-3,5\right|+0,5\ge0,5\)

Dấu "=" xảy ra khi:

\(\left|x-3,5\right|=0\Rightarrow x=3,5\)