Question

Resolva : dica=(,) [,] {,}

01- 15-(3-2)+(7-4)=

02- 25-(8-5+3)-(12-5-8)=

03- (10-2)-3+(8+7-5)=

04- (9-4+2)-1+(9+5-3)=

05- 18-[2+(7-3-8)-10]=

06- 4+[-3(5+9-2)]=

07- 6-[10+(8-3)-1]=

08- 8-[-2-(-12)+3]=

09- 25-{-2+[6+(-4-1)]}=

10- 17-{5-3+[8-(-1-3)+5]}=

Answer 1

a) 15 - 1 + 3 = 14 + 3 = 17
b) 25 - 6 - (-1) = 25 - 6 + 1 = 26-6 = 20
c) 8 - 3 + 10 = 5 + 10 = 15
d) 7 - 1 + 11 = 6 + 11 = 17
e) 18 - [2 - 4 -10] = 18 - [-12] = 18 + 12 = 30
f) 4 + [-3 + 12] = 4 + 9 = 13
g) 6 - [10 +5-1] = 6 - 14 = - 8
h) 8 -[-2 + 12 + 3] = 8 - 13 = - 5 
i ) 25 - { -2 + [6-5]} = 25 - { -2 +1} = 25 - {-1} = 25 + 1 = 26
j) 17 - {5- 3+[8 + 4 + 5]} = 17 - {5-3+17} = 17 -  19 = -2             ok