/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: HngBng https://cdn.slidesharecdn.com/profile-photo-HngBng-48x48.jpg?cb=1523481986 12a1 khoa 2009-2012 tại THPT Toan thang-Tien Lang-HP.