Respostas

2014-03-17T21:31:53-03:00
4.(1-1/3+1/5-1/7+1/9-1/11+1/13-1/15)
4.(1-3+5-7+9-11+13-15)
+4-12+20-28+36-44+52-60
-8 -8 -8 -8
-32