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</span><span id="8olij7r" class="op-item-meat">（a+b）<sup>2</sup>=a<sup>2</sup>+2ab+b<sup>2</sup></span></span> <span id="ttmdfox" class="op-item"><span id="mcog7yi" class="op-item-nut">B . </span><span id="penjqzo" class="op-item-meat">（a﹣b）<sup>2</sup>=a<sup>2</sup>﹣2ab+b<sup>2</sup></span></span> <span id="bg7g2z2" class="op-item"><span id="agr7hgg" class="op-item-nut">C . </span><span id="it7vguf" class="op-item-meat">a<sup>2</sup>﹣b<sup>2</sup>=（a+b）（a﹣b）</span></span> <span id="dzoqnr2" class="op-item"><span id="arulgg2" class="op-item-nut">D . </span><span id="vusyauo" class="op-item-meat">（a+b）（a﹣2b）=a<sup>2</sup>﹣ab﹣2b<sup>2</sup></span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="mbp2vf7" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="jdwddtn" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=2663791" 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