Question

dau coroana pls ajutati​

Answer 1

Explicație pas cu pas:

29.a)

$(x - 2) \in \mathcal{M}_{10}$

$x \leqslant 79 \iff x - 2 \leqslant 77$

$\implies (x - 2) \in \Big\{ 0; 10; 20; 30; 40; 50; 60; 70\Big\} \Big|_{(+2)} \\ \implies x \in \Big\{ 2; 12; 22; 32; 42; 52; 62; 72\Big\} \\ \iff A = \Big\{ 2; 12; 22; 32; 42; 52; 62; 72\Big\}$

b)

$(2x) \ \ \vdots \ \ 6 \implies x \in \mathcal{M}_{3}$

$\implies B = \Big\{ 21; 24; 27; 30; 33; 36; 39; 42; 45; 48; 51\Big\}$

c)

5 | (x + 10)

5 | 10 => 5 | x

$\implies x \in \Big\{ 0; 5; 10; 15; 20; 25; 30; 35\Big\}$

$\iff C = \Big\{ 0; 5; 10; 15; 20; 25; 30; 35\Big\}$