Question

Eliminando parenteses, colchetes e chaves, determine as somas algebricas:
A) 21-[-17+(19-4)+12]
B) 39+[-10-(+32-10-8)+9]
C) 37+[-25-(-11+19-4)]
D) 6-{-9+[-1+14-(8+17-12)]}

Answer 1

A) 21-[-17+(19-4)+12]

21-[-17+19-4+12]

21+17-19+4-12=11

B)39+[-10-(+32-10-8)+9]

39+[-10-32+10+8+9]

39-10-32+10+8+9=24

C)37+[-25-(-11+19-4)]

37+[-25+11-19+4]

37-25+11-19+4=8

D) 6-{-9+[-1+14-(8+17-12)]}

6-{-9+[-1+14-8-17+12]}

6-{-9-1+14-8-17+12}

6+9+1-14+8+17-12=15

$+ + = + \\ - + = - \\ - - = +$