Problème 1 :

<div dir="ltr" style="text-align: left;" trbidi="on"> <br /> <br /> <br /> <br /> <b><span style="color: #660000; font-size: large;"><br /></span></b> <div style="text-align: left;"> <b>Soit a,b et c trois nombre réel positive.</b><b><br /></b></div> <div style="text-align: left;"> <b>Montrer que :</b></div> <b><span style="color: #660000; font-size: large;">    </span></b><br /> <div class="separator" style="clear: both; text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaWEKpdzJcfCL-WqewRMX2r_CDs8fnnMubSWkCCMBbtjjlphBicAjLZj_PurGEdrRTTG-tM5fvGBME8BJnjwhaVryy2tfdvJ5WiL2aSgb2r2dcUSQO2x1c_a1HlNFStJYg-yNNYDjjDik/s1600/1.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="76" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaWEKpdzJcfCL-WqewRMX2r_CDs8fnnMubSWkCCMBbtjjlphBicAjLZj_PurGEdrRTTG-tM5fvGBME8BJnjwhaVryy2tfdvJ5WiL2aSgb2r2dcUSQO2x1c_a1HlNFStJYg-yNNYDjjDik/s1600/1.JPG" width="400" /></a></div> <b><span style="color: #660000; font-size: large;">                         </span></b><br /> <div class="separator" style="clear: both; text-align: center;"> <b><span style="color: #660000; font-size: large;"><br /></span></b></div> </div>

Soit a,b et c trois nombre réel positive. Montrer que :                               

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