1.30.2015

bất phương trình bậc 2

bất phương trình bậc 2
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuHhrb89-FAhZaMl7k4i17WIXs_y6zgmpMBXO4yA3DRl3LTogNTIQtjqzy-ljgvb9cO9S6IIq-gjafiMjDVriaLU9UzPyeOgWLWlxIBVXu6PQz3xt9_a9j2NPNOAMbM3IZ3Zsw5BMYSoo/s72-c/134pjg.JPG

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