Question

repede pls! daca e corect dau coroana si multe puncte

Answer 1

Explicație pas cu pas:

c)

$|x - 1| < 3$

$- 3 < x - 1 < 3 \\ - 3 + 1 < x < 3 + 1 \\ - 2 < x < 4$

$C = \{-1; 0; 1; 2; 3\}$

d)

$- 18 < x \leqslant 2$

$D = \{-16; -14; -12; -10; -8; -6; -4; -2; 0; 2\}$

e)

$|2x - 1| < 19 \\ - 19 < 2x - 1 < 19 \\ - 19 + 1 < 2x < 19 + 1 \\ - 18 < 2x < 20 \\ - 9 < x < 10$

$E = \{-6; -3; 0; 3; 6; 9\}$

f)

$\frac{13}{x + 2} \in\mathbb{N}$

$= > x + 2 \in \{1; 13\}$

$x + 2 = 1 = > x = - 1$

$x + 2 = 13 = > x = 11$

$F = \{-1; 11\}$