Respostas

2013-08-25T12:35:26-03:00
1) soma Pa
Sn=n(a1+an)/2
Sn=306(1+306)/2=46971i

2)(-7i)2/(3i)2=-14i/6i
=>-14i*(-6i)/6i*(-6i)=-84/36=-7/3

3)
 i 1.000/i 235  
===> i1000*(-i235)/i235*(-i235)=235000/55225=4,2
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