https://spreadsheets.google.com/ccc?key=0AnLXYYchgop0dDFTQjVHRHB0OHFBSmg5ajV1ZEttTnc&hl=es#gid=0
primer punto parcial
https://spreadsheets0.google.com/ccc?hl=es&key=tga1nNbZA3LWvMv05w1_x9g&hl=es#gid=0
segundo punto parcial
https://docs.google.com/document/d/1ItJI2ttn-XheoKbyTLqYTs9BCDXAXpz3OwqsXoJHYuY/edit?hl=es#
tercer punto parcial