Question

17. Calcule o valor das expressões :
a) (-10)-(-8) + (-2)-(+ 5 ) + (-3)
b) ( 20 - 25) -5 + ( 18 -7 + 5)
c) 844-6)+(-5)+(8-3 +5 -10 +12)
d) ( + 3 -10 -5 +7 -12)-(-8 +3 - 4 + 6-18 ) =
e) +10 + (-6-3) - 4 -(+8-5)-(-7+ 12 )
f) + 14 - 21 + 45 - 6 - 8 + 35 -50 + 21
g) + 8 - 5+3 -4 + 7 - 2 + 6 =

Answer 1

A) (-10)-(-8) + (-2)-(+ 5 ) + (-3)=

-10+8-2-5-3=

-10+8-2-8=

-10+8-10=

-10-2=

-12.

B) ( 20 - 25) -5 + ( 18 -7 + 5) =

-5 -5+ (18-2)

-5 -5 + 16=

-5+11=

6 ou +6.

C) (844-6)+(-5)+(8-3 +5 -10 +12)=

(844-6)+(-5)+(8-3 +5 +2)=

(844-6)+(-5)+(8-3 +7)=

(844-6)+(-5)+(8+4)=

838 -5+12=

838+7=

845 ou +845.

D) ( + 3 -10 -5 +7 -12)-(-8 +3 - 4 + 6-18 ) =

( + 3 -10 -5 -5)-(-8 +3 - 4 -16)=

( + 3 -10 -10)-(-8 +3 - 20)=

( + 3 -20) - (-8 -17)=

-17- (-25)=

-17+25=

8 ou+ 8.

E) +10 + (-6-3) - 4 -(+8-5)-(-7+ 12 )=

+10 + (-9) - 4 -(+3)-(+5 )=

+10 -9 - 4 -3 -5 =

+10 -9 -4 - 8=

+10 - 9 - 12=

+10 - 21=

11 ou + 11.

F) + 14 - 21 + 45 - 6 - 8 + 35 -50 + 21=

+ 14 - 21 + 45 - 6 - 8 + 35 -29 =

+ 14 - 21 + 45 - 6 - 8 + 6 =

+ 14 - 21 + 45 - 6 - 2 =

+ 14 - 21 + 45 - 8 =

+ 14 - 21 + 37 =

+ 14 +16 =

30 ou +30.

G) + 8 - 5+3 -4 + 7 - 2 + 6 =

+ 8 - 5+3 -4 + 7 + 4 =

+ 8 - 5+3 -4 + 11 =

+ 8 - 5+3 + 7 =

+ 8 - 5+10=

+ 8 +5 =

13 ou +13.