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class="pointer">初中數(shù)學(xué)</a> <span>/</span> <a href="javascript:;">單選題</a> </div> <div id="ls7bizd" class="m-wrap g-cw cfx"> <div id="dkorarz" class="w fl"> <div id="ljwdw7b" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="ndyeib1" class="question-block"> <div id="wb5lrtg" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5225638.shtml" class="ques-origin a-pointer" target="_blank"> (2023九上·婁底月考) </a> 某開發(fā)公司2021年投入的研發(fā)資金為100億元，為了擴(kuò)大產(chǎn)品的競爭力，該公司不斷增加研發(fā)投資，計劃2023年投入400億元研發(fā)資金．若2021年到2023年投入的研發(fā)資金年平均增長率均為<em><span>x</span></em> ，則下列方程中正確的是（　?。? </h1> <div id="qok73k3" class="exam-s"> <span id="4ssltto" class="op-item"><span id="r522bcv" class="op-item-nut">A . </span><span id="3htzfit" class="op-item-meat">100（1+<em><span>x</span></em>）＝400</span></span> <span id="rj4fp1i" class="op-item"><span id="5mollzz" class="op-item-nut">B . </span><span id="rzmdoee" class="op-item-meat">100（1+2<em><span>x</span></em>）＝400</span></span> <span id="jinskl6" class="op-item"><span id="etyevgs" class="op-item-nut">C . </span><span id="hxj63ra" class="op-item-meat">100（1+<em><span>x</span></em>）+100（1+<em><span>x</span></em>）<sup><span>2</span></sup>＝400</span></span> <span id="yosox6z" class="op-item"><span id="nkucadr" class="op-item-nut">D . </span><span id="m7gd2or" class="op-item-meat">100（1+<em><span>x</span></em>）<sup><span>2</span></sup>＝400</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="ra3y6mw" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="ee35hke" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=55179880" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="tcxo5zq" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過本題的試卷</h3> <ul class="extend-mc"> <li> <a 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