Question

1)Calcule as expressões:

a)15-(3-2)+(7-4)=17

b)25-(8-5+3-(12-5-8)=20

c)(10-2)-3+(8+7-5)=15

d)(9-4+2)-1+(9+5-3)=17

e)18-[2+(7-3-8)-10]=30

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

Answer 1

a) 15-(3-2)+(7-4)=17
    15-1+3-17
     14-14=0

b) 25-(8-5+3)-(12-5-8)=20
    25-6+1-20=0

c) (10-2)-3+(8+7-5)=15
     8-3+10-15=0

d) (9-4+2)-1+(9+5-3)=17
     7-1+11-17=0

e) 18-[2+(7-3-8)-10]=30
     18-[2-4-10]=30
      18+12-30=0

f) -4+[-3+(-5+9+2)]=-5
   -4+[-3+6]=-5
   -4+3+5=4