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href="/paper/view-5077676.shtml" class="ques-origin a-pointer" target="_blank"> (2022·南山模擬) </a> “數(shù)形結(jié)合”思想是數(shù)學(xué)學(xué)習(xí)的一個(gè)重大思想．通過(guò)巧妙運(yùn)用幾何代數(shù)的結(jié)合性有時(shí)能將某些難題迎刃而解．已知a，b，c，d均為實(shí)數(shù)，a<sup>2</sup>+b<sup>2</sup>＝c<sup>2</sup>+d<sup>2</sup><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，則<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsup%3E%3Cmrow%3E%3Cmi%3Ea%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3Cmsup%3E%3Cmrow%3E%3Cmi%3Ec%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsup%3E%3Cmrow%3E%3Cmi%3Eb%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3Cmsup%3E%3Cmrow%3E%3Cmi%3Ed%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3Cmo%3E%2B%3C%2Fmo%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">abcd的最大值為（　　） </h1> <div id="estkgi7" class="exam-s"> <span id="szcj74h" class="op-item"><span id="ykmfxfa" class="op-item-nut">A . </span><span id="pvzyykf" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="o85gzdr" class="op-item"><span id="gmxf8wo" class="op-item-nut">B . </span><span id="qd99s74" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="fiksbpr" class="op-item"><span id="cq6b66b" class="op-item-nut">C . </span><span id="qlon8qr" class="op-item-meat">1</span></span> <span id="nlzrpy2" class="op-item"><span id="ek68hrg" class="op-item-nut">D . </span><span id="00q2sse" class="op-item-meat">2</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="8hiasup" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="jfsat0x" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=51744103" 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="lc74uhc" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過(guò)本題的試卷</h3> <ul class="extend-mc"> <li> <a href="/paper/view-5080639.shtml" target="_blank" title="2022年初中數(shù)學(xué)蘇科版《中考二輪復(fù)習(xí)》專題二函數(shù) 2.3 二次函數(shù)" class="ex-tit"> <b></b><span>2022年初中數(shù)學(xué)蘇科版《中考二輪復(fù)習(xí)》專題二函數(shù) 2.3 二次函數(shù)</span> </a> </li> <li> <a href="/paper/view-5077676.shtml" target="_blank" title="廣東省深圳市南山區(qū)2022年三月份中考數(shù)學(xué)模擬試題" class="ex-tit"> 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