Question

calcule as seguintes somas algebricas:

a) 6 + ( - 9 + 1 )
b) 8 - (- 6 + 10 )
c) - 10 + ( 6 - 4 )
d) 2 + ( 2 + 5 - 7 )
e) - 5 + ( 2 - 4 ) - ( 7 - 1 )
f) ( - 5 + 3 ) - (5 - 9 ) + ( 8 - 1 ) - 11

Answer 1

a) 6+ (-9+1) = 6+(-8) = 6-8 = -2

b) 8- (-6+10) = 8-(+4) = 8-4 = 4

c) -10 +(6-4) = -10+(2) = 10+2 = -8

d) 2+ (2+5-7) = 2+(7-7) = 2+0 = 2

e) -5 + (2-4) - (7-1) = 5+(-2)-(6) = 5-6-2 = -7-6 = 13

F) (-5+3) - (5-9) + (8-1) -11 = -2 - (-4) +7-11 = 2+4+7-11 = 2+7-11= 9-11 = -2