Question

Ola pessoal estou com duvida como arma essas contas essas contas e responder
1)15-(3-2)+(7-4)=
2)25-(8-5+3)-(12-5-8)=
3)(10-2)-3+(8+7-5)=
4)(9-4+2)-1+(9+5-3)=
5)18-[2+(7-3-8)-10]=
6)-4+[-3+(-5+9-2)]=
7)-6-[10+(-8-3)-1]=
8)-8-[-2-(-12)+3]=
9)25-{2-[6+(-4-1)]}=
10)17-{5-3+[8-(-1-3)+5]}=
11)3-{5-[8-2+(5+9)]}=
12)-10-{-2+[+1-(-3-5)+3]}=
13){2+[1+(-15-15)-2]}=
14){30+[10-5+(-2-3)]-18-12}=
16)-4-{2+[-3-(1+7-3)-2]+6=
17)10-{-2+[+1+(+7-3)-2]+6}=
18)-{-2-[-3-(-5)+1]}-18=
19)-20-{-4-[-8+(+12-6-2)
20){[(-50-1-)+-11+19]+20}+10=

Answer 1

1)15-(3-2)+(7-4)= 15-1+3==> 17
2)25-(8-5+3)-(12-5-8)= 25-6+1==> 20
3)(10-2)-3+(8+7-5)= 8-3+10==> 15
4)(9-4+2)-1+(9+5-3)= 7-1+11==> 17
5)18-[2+(7-3-8)-10]= 18-2+4+10==> 30
6)-4+[-3+(-5+9-2)]= -4-3+2==> - 5
7)-6-[10+(-8-3)-1]= - 6 +2 ==> - 4
8)-8-[-2-(-12)+3]= -8-13==> - 21
9)25-{2-[6+(-4-1)]}=25-1==> 24
10)17-{5-3+[8-(-1-3)+5]}= 17-19==> - 2
11)3-{5-[8-2+(5+9)]}= 3+15==> 18
12)-10-{-2+[+1-(-3-5)+3]}= -10-10==> - 20
13){2+[1+(-15-15)-2]}= - 29
14){30+[10-5+(-2-3)]-18-12}= 0 
16)-4-{2+[-3-(1+7-3)-2]+6= -4 
17)10-{-2+[+1+(+7-3)-2]+6}= 10-7==> 3  
18)-{-2-[-3-(-5)+1]}-18= - 23
19)-20-{-4-[-8+(+12-6-2)= - 20 
20){[(-50-1-)+-11+19]+20}+10= - 13