Question

Tìm min hoặc max

|x-3|+|x-5|+|x+2|-4

Answer 1

\(A=\left|x-3\right|+\left|5-x\right|+\left|x+2\right|-4\ge\left|x-3\right|+\left|5-x+x+2\right|-4\)

\(A\ge\left|x-3\right|+3\ge3\)

\(A_{min}=3\) khi \(x=3\)