Question

Dau coroana am nevoie urgent plzz​

Answer 1

Salut!

Răspuns:

A = { x € Z | | x | = 4 si | x | = 9 }

| x | = 4 ===> x € { -4; 4 }

| x | = 9 ===> x € { -9; 9 }

A = { -9; -4; 4; 9 }

B = { x € Z | x + 1 >= -1 si | x + 2 | < 4 }

[tex]x + 1 \geqslant - 1 \\ x \geqslant - 1 - 1 \\ x \geqslant - 2

x € { -2; -1; 0; 1; 2... }

| x + 2 | < 4 ===> 1 ) x + 2 < 4

2 )x + 2 < -4

1 ) x + 2 < 4

x < 4 - 2

x < 2

x € { 1; 0 ; -1 ... }

2 ) x + 2 < -4

x < -4 - 2

x < -6

x € { -7 ; -8 -9 ... }

B = { -7; -8; -9 ... }