Question

-Efetue as multiplicações :
A) ( -6) . ( -10)=
B) ( -8) . ( +15) =
C) ( +4) . ( -2) . ( +3) =
D) ( +3) . ( -1) . ( -2) . ( +5) =
E) ( -1) . ( -2) . ( -3) . ( -3) . ( -2) . ( -1) =

Answer 1

A) ( -6) . ( -10)= +60
B) ( -8) . ( +15) = -120
C) ( +4) . ( -2) . ( +3) = -24
D) ( +3) . ( -1) . ( -2) . ( +5) = +30
E) ( -1) . ( -2) . ( -3) . ( -3) . ( -2) . ( -1) = +36

Multiplicação de sinais:
+ . - = -
- . - = +
+ . + = +

Espero ter ajudado!