Efetue mentalmente as adições algébricas a seguir: a)-6+8+6-4+4+1
b)4-9+2-1+9-2
c)5+6-7+1+7-10
d)12-6+5-5+6-12
b)4-9+2-1+9-2
c)5+6-7+1+7-10
d)12-6+5-5+6-12
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