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(2023八上·開州期中) </a> 下列運算中正確的是（　?。? </h1> <div id="5tpzf9v" class="exam-s"> <span id="n9ptzjb" class="op-item"><span id="rhfjnjh" class="op-item-nut">A . </span><span id="zhxbnr5" class="op-item-meat">3<em><span>a</span></em><sup><span>2</span></sup>﹣<em><span>a</span></em><sup><span>2</span></sup>＝3</span></span> <span id="jrrf7lb" class="op-item"><span id="b7ldnff" class="op-item-nut">B . </span><span id="nptlpvt" class="op-item-meat">2<em><span>a</span></em>+3<em><span>b</span></em>＝5<em><span>ab</span></em></span></span> <span id="rn7db3j" class="op-item"><span id="zfjxxrf" class="op-item-nut">C . </span><span id="5nl5xhv" class="op-item-meat"><em><span>a</span></em><sup><span>2</span></sup>+<em><span>a</span></em><sup><span>2</span></sup>＝<em><span>a</span></em><sup><span>4</span></sup></span></span> <span id="rff7jpd" class="op-item"><span id="35f3n7p" class="op-item-nut">D . </span><span id="bbjtrz5" 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