Question

1) Calcule:
a) (+3) x (+2) =
b) ( - 6) x (+7) =
c) ( 0 ) x ( -12) =
d) ( -8) x ( - 9) =
e) (-10) x ( +4) =
f) (-8) x ( -10) =
g) (+6) x (+1) x (2)=

Answer 1

Resposta:

a) ( 3) . (-1) . ( -2) - 1 => resolva primeiro as multiplicações:

3 . -1 . -2 = 6 ( o sinal - do 1 e - do 2 se torna +).

logo a resposta é: 6 - 1 +> 5 .

b) [ ( -14 ÷ - 7 ) + ( -8 ÷ 2)] . (-1 ) =>> [ (2 ) + ( -4) ] . (-1 ) =>> [ - 2] .( -1 ) => 2 .

c) ( 8 - 3 . 3 + 2 ) . ( 10 - 4 . 3 + 1)

==>> ( 8 - 9 + 2) . ( 10 - 12 + 1) +>> 1 . (-1 ) =>> -1 .

d) 0 - [ 8 - (9 - 6) . ( 8 - 9) - 1 ] =>> 0 - [ 8 - (3) . (-1) - 1 ] =>>> 0 -[ 8 - (-3) - 1 ] =>> 0 - [ 8 + 3 - 1] =>> 0 - [ 10] =>> -10 .

e) 18 [ (- 9 ÷ 3 ) + 2 . 4 - 1 ] =>> 18 [ -3 + 8 - 1] =>> 18 [ 4 ] =>> 72 .

f ) -16 + [ 8 ÷2 + 10 ÷ 2 - 1 ] =>> - 16 + [ 4 + 5 - 1 ] =>> -16 + [ 8] =>> -16 + 8 => - 8.

g) -6 + (12 ÷ 4 ) - ( 9 ÷ 3 ) - ( 10 ÷ 2) =>> - 6 + 3 - 3 - 5 =>> - 11 .

h) [ 13 - ( 9 - 5 - 8) + 1 ] ÷ ( - 9 ) =>> [ 13 - ( - 4) + 1 ] ÷ ( -9) =>> [ 13 + 4 + 1 ] ÷ ( -9) =>> [ 18] ÷ ( - 9) => -2 .