\(\left|2x+5\right|+\left|-2x+9\right|+5\)
\(\ge\left|2x+5-2x+9\right|+5\)
\(=14+5\)
\(=19\)
Dấu "=" xảy ra khi:\(\left(2x+5\right)\left(9-2x\right)\ge0\)
\(\Leftrightarrow-\frac{5}{2}\le x\le\frac{9}{2}\)
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