Question

(+4)+(_6)_(+7)_(_6)+(+7)

Answer 1

Resposta:

> Regras de sinais:

( + ) com ( + ) = ( + )

( - ) com ( - ) = ( + )

( + ) com ( - ) = ( - )

( - ) com ( + ) = ( - )

______________

> (+4)+(-6)-(+7)-(-6)+(+7)

= (+4)-6-(+7)-(-6)+(+7)

= -2-(+7)-(-6)+(+7)

= -9-(-6)+(+7)

= -9+6+(+7)

= -3+(+7)

= +4