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</a> 為執(zhí)行國家藥品降價政策，給人民群眾帶來實惠，某藥品經(jīng)過兩次降價，每盒零售價由16元降為9元，設(shè)平均每次降價的百分率是x，則根據(jù)題意，下列方程正確的是（　?。? </h1> <div id="zjnjfjv" class="exam-s"> <span id="fxlpb73" class="op-item"><span id="p3jf9n3" class="op-item-nut">A . </span><span id="33x9r35" class="op-item-meat">16（1﹣x）<sup><span>2</span></sup>＝9</span></span> <span id="d1vr3ph" class="op-item"><span id="tlrxhtv" class="op-item-nut">B . </span><span id="frlvt5j" class="op-item-meat">16（1﹣x<sup><span>2</span></sup>）＝9</span></span> <span id="9p1zxn9" class="op-item"><span id="zlvb5hz" class="op-item-nut">C . </span><span id="hb53pb3" class="op-item-meat">9（1﹣x）<sup><span>2</span></sup>＝16</span></span> <span id="37tpzx5" class="op-item"><span id="b3rnhxn" class="op-item-nut">D . </span><span id="zprrdtx" class="op-item-meat">9（1+x<sup><span>2</span></sup>）＝16</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="97bdzlp" id="J_ConnectQuestionsdBox"> 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