Question

 Tìm x ∈ Z, biết:

a) -5 < x < 0;                  b) -3 < x < 3.

Answer 1

a) x = -4 hoặc x = -3 hoặc x = -2 hoặc x = -1.

b) x = -2 hoặc x = -1 hoặc x = 0 hoặc x = 1 hoặc x = 2.

Answer 2

a) \(-5< x< 0\)

\(\Rightarrow x\in\left\{-4;-3;-2;-1\right\}\)

b) \(-3< x< 3\)

\(\Rightarrow x\in\left\{-2;-1;0;1;2\right\}\)

Answer 3

a) -5 < x <0

\(\Rightarrow\) x = -4; -3; -2; -1

b) -3 < x < 3

\(\Rightarrow\) x = -2; -1; 0; 1; 2

Answer 4

x=-4;x=-3;x=-2;x=-1

Answer 5

\(a.\)

\(-5< x< 0\)

\(\Rightarrow x\in\left\{-4;-3;-2;-1;\right\}\)

Vậy :    \(x\in\left\{-4;-3;-2;-1;\right\}\)

\(b.\)

\(-3< x< 3\)

\(\Rightarrow x\in\left\{-2;-1;0;1;2\right\}\)

Vậy :     \(x\in\left\{-2;-1;0;1;2\right\}\)