Question

calcule mentalmente os produtos : a)(+ 6) . (+ 4) = b)(+ 6) . (- 4) = c)(- 6) . (+ 4) = d)(- 6) . (- 4) = e)(+ 3) . (+ 5) = f)(- 7 ) . (+ 4) = g)(+7) . (- 4) = h)(- 3) . (- 5) =


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Answer 1

→ Cálculo :

Regra de sinal :        

( - ) ( - ) = +  

( + ) ( + ) = +  

( - ) ( + ) = -  

( + ) ( - ) = -

A) ( + 6 ) · ( + 4 ) = +24

B) ( + 6) · ( - 4 ) = -24

C) ( - 6 ) · ( + 4 ) = -24

D) ( - 6) · ( - 4) = +24

E) ( + 3 ) · ( + 5 ) = +15

F) ( - 7 ) · ( + 4 ) = -28

G) ( +7 ) · ( - 4 ) = -28

H) ( - 3 ) · ( - 5 ) = +15