Números Inteiros

A temperatura mínima registada é 5 graus Celsius.

O comprimento da sala de aula da escola do Xavier.

Uma dívida de 5 euros.

Receber 5 euros de prenda de aniversário.

$$-1\in N$$

$$0\in N$$

$$-45\in Z^+$$

$$-7\notin Z^-$$

$$A\rightarrow-2\ \ \ e\ \ \ B\rightarrow3$$

$$A\rightarrow-1\ \ \ e\ \ \ B\rightarrow2$$

$$A\rightarrow1\ \ \ e\ \ \ B\rightarrow-2$$

$$A\rightarrow-1\ \ \ e\ \ \ B\rightarrow3$$

5 ; 8

0 ; -8

-5 ; -8

-5 ; 8

-3

-1

1

3

$$-2<-12$$

$$\left|-20\right|<\left|20\right|$$

$$\left|-6\right|<-6$$

$$-3>-4$$

7, 5, -6, -15, -20

-2, -16, -45, 0, 28, 56

-1, -2, 0, 1, 2, 3

-25, -13, -1, 0, 6, 37

$$\left(-65\right)+\left(+15\right)=-80$$

$$\left(-65\right)+\left(+15\right)=-50$$

$$\left(-65\right)+\left(+15\right)=50$$

$$\left(-65\right)+\left(+15\right)=80$$

$$\left(-23\right)+\left(+24\right)=1$$

$$\left(+45\right)+\left(-2\right)+\left(-16\right)=\left(+45\right)+\left(-18\right)$$

$$\left(-23\right)+\left(+24\right)=\left(+24\right)+\left(-23\right)$$

$$\left(-23\right)+\left(+8\right)=\left(-30\right)+\left(+1\right)+\left(+8\right)$$

$$\left(-23\right)+\left(+24\right)=\left(+24\right)+\left(-23\right)$$

$$\left(-23\right)+\left(+24\right)=1$$

$$\left(+45\right)+\left(-2\right)+\left(-16\right)=\left(+45\right)+\left(-18\right)$$

$$\left(-29\right)+\left(+8\right)=\left(-30\right)+\left(+1\right)+\left(+8\right)$$