Question

B=/x+2,5/-3,7

Answer 1

Ta có :

\(\left|x+2,5\right|\ge0\)

\(\Leftrightarrow\left|x+2,5\right|-3,7\ge-3,7\)

Dấu "=" xảy ra khi

\(\left|x+2,5\right|=0\)

\(\Leftrightarrow x+2,5=0\)

\(\Leftrightarrow x=-2,5\)

Vậy B đạt GTNN = -3,7 khi \(x=-2,5\)

Answer 2

\(B=\left|x+2,5\right|-3,7\)

\(\left|x+2,5\right|\ge0\forall x\)

\(B=\left|x+2,5\right|-3,7\ge-3,7\)

Dấu"=" xảy ra khi:

\(\left|x+2,5\right|=0\Rightarrow x=-2,5\)

Vậy...