Question

salut, ma poate ajuta cineva la aceste exerciții? sau doar la unul dintre el ofer 100 de puncte și coroana. Ex 5si 9​

Answer 1

$\bf 9\\ \\ \it \sqrt{(-3)^2} < x < |-5| \Rightarrow |-3| < x < |-5| \Rightarrow 3 < x < 5\stackrel{x\in\mathbb{Z}}{\Longrightarrow}\ A=\{4\}\\ \\ \\ 2\leq\sqrt{y^2}\leq2^2 \Rightarrow 2\leq|y|\leq4\Rightarrow |y|\in\{2,\ 3,\ 4\} \Rightarrow y\in\{\pm2,\ \pm3,\ \pm4\} \Rightarrow \\ \\ \Rightarrow B=\{-4,\ -3,\ -2,\ 2,\ 3,\ 4\}$

$\it \bigg|z+\dfrac{2}{5}\bigg|=\dfrac{3}{5} \Rightarrow z+\dfrac{2}{5}=\pm\dfrac{3}{5} \Rightarrow z+\dfrac{2}{5}\in\bigg\{-\dfrac{3}{5},\ \dfrac{3}{5}\bigg\}\bigg|_{-\frac{2}{5}}\Rightarrow\\ \\ \\ \Rightarrow z\in\bigg\{-1,\ \dfrac{1}{5}\bigg\} \Rightarrow C=\bigg\{-1,\ \dfrac{1}{5}\bigg\}$