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Recuperados de: https://www.google.com.py/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CBwQFjAA&url=http%3A%2F%2Fmiwikideaula.wikispaces.com%2Ffile%2Fview%2Fmat_val_num_expre_alge.doc&ei=_MjsVN6NN-zbsASy5IKABw&usg=AFQjCNERojLt0SwnpK-mt_6wfJJ8CCcuSw&bvm=bv.86475890,d.aWw.