Question

5-calcule e depois responda
a)(+9)•(-1)
b)(-20)•(-1)
c)(+32)•(-1)​

Answer 1

→ Cálculo :

Regra de sinal :        

( - ) ( - ) = +  

( + ) ( + ) = +  

( - ) ( + ) = -  

( + ) ( - ) = -

A) ( + 9 ) · ( - 1 ) = -9

B) ( - 20 ) · ( - 1 ) = +20

C) ( + 32 ) · ( - 1 ) = -32