Respostas

A melhor resposta!
2013-12-09T00:47:05-02:00
A) 80+20-60-10= 100-70=30
b) 30-10-10+20= 20+10=30
c) 10-10+10-20= 0-10= -10 
d) -10-30+20+50= -40+70 = 30

Resposta a alternativa C.
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2013-12-09T01:17:12-02:00