Question

Answer 1

Ta có:

\(\left|x-9\right|\ge0\forall x\)

=> \(A=\left|x-9\right|+1\ge1\forall x\)

Dấu "=" xảy ra khi \(\left|x-9\right|=0\)

=> x = 9

Vậy MinA = 1 khi x = 9

Answer 2

Ta có: \(\left|x-9\right|\ge0\forall x\)

\(\Leftrightarrow\left|x-9\right|+1\ge1\forall x\)

Dấu '=' xảy ra khi x=9