toán Violimpic lớp 7

M

maloimi456

Ta có: |2x+2015| \geq 0, \forall x
\Rightarrow |2x+2015|- 3 \geq -3, \forall x
Hay A \geq -3
Vậy [LATEX]A_{min} = -3[/LATEX] \Leftrightarrow 2x + 2015 = 0 \Rightarrow [LATEX]x = \frac{-2015}{2}[/LATEX]
 
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