Question

|x |=10, forall x in R
|x|<=10, forall x in R
|x|>10, forall x in R
​

Answer 1

Explicație pas cu pas:

$|x| = 10 \\ x = - 10 \\ x = 10 \\ x \in \Big\{-10;10\Big \}$

$|x| \leqslant 10 \\ - 10 \leqslant x \leqslant 10 \\ x \in \Big[ - 10 ;10\Big]$

$|x| > 10 \\ x < - 10 \ \ \ sau \ \ \ x > 10\\ x \in \Big(-\infty ; - 10 \Big) \cup \Big(10 ; +\infty \Big)$