/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: RYUSEYKEN https://cdn.slidesharecdn.com/profile-photo-RYUSEYKEN-48x48.jpg?cb=1586980160 ENSEÑANZA DE LAS MATEMATICAS EN LOS GRADOS DE SECUNDARIA SEP