calcule o valor das seguintes expressões :
a) -10-(-7+4-6)
b)-14-(7-6)+(8-5)
c)10-{-2+[1+(+4)-8]}
d)25+[-4+1-(-3+7)]
e)21-[-17+(19-4)+12]
f)39+[-10-(+32-10-8)+9]
g)6-{-9+[-1+14-(8+17-12)]}
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