二次方程计算器| 二次求解器/title> <meta name="description" content="二次方程求解器计算器。"> <style> @media all and (max-width: 576px) { .calc2 tr:nth-child(2) input { width:50px; } } @media all and (min-width: 577px) { .calc2 tr:nth-child(2) input { width:70px; } }</style>  <link rel="canonical" href="https://www.titaotie.com/calc/math/quadratic-calculator.html" /> <script async src="../../assets/js/coun-w3.js" ></script>  <script async src="https://www.googletagmanager.com/gtag/js?id=G-3LS30VWYXF"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-3LS30VWYXF'); </script> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1832854270693044" crossorigin="anonymous"></script> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?ac0ee223cbf63018bf5c2c97c286c454"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> <meta name="dateModified" content="2026-05-15"> </head> <body> <div id="header"> <div> <div id="logo" class="box"> <p> <a href="../../index.htm">无涯在线工具箱</a> </p> </div> </div> </div> <div id="wrapper"> <div id="nav">  <a href="../../index.htm">首页</a>/<a href="../index.html">计算器</a>/<a href="index.html">数学计算器</a>/二次方程计算器!-- #EndEditable --> </div> <div id="top-ad"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-1832854270693044" data-ad-slot="2671835991" data-ad-format="auto" data-full-width-responsive="true"></ins> </div> <div id="lcol"> <div id="doc">  <p class="doc-update">最后修改时间：2026年5月15日</p> <h1>二次方程计算器</h1> <p>二次方程求解器计算器。</p> <p>输入二次方程系数a，b，c，然后按<i>计算</i>按钮。</p> <form name="calcform" autocomplete="off"> <table class="calc2"> <tbody> <tr> <td> </td> <td><i>输入一为</i>）</td> <td> </td> <td><i>输入b</i>）</td> <td> </td> <td><i>输入c</i>）</td> <td> </td> </tr> <tr> <td>二次方程）</td> <td><input type="number" step="any" name="x" class="intext"></td> <td style="font-size: 2.1em;" class="math"><i>x </i><span style="font-size: 0.8em"><sup>2</sup> +</span></td> <td><input type="number" step="any" name="x2" class="intext"></td> <td style="font-size: 2.1em" class="math"><i>x </i><span style="font-size: 0.8em">+</span></td> <td><input type="number" step="any" name="x3" class="intext"></td> <td style="font-size: 2.1em" class="math">= 0</td> </tr> <tr> <td> </td> <td colspan="6"> <input onclick="calc4()" type="button" value="Calculate" class="btn" tabindex="4"> <input onclick=setfocus() type="reset" value="重置" class="btn"></td> </tr> <tr> <td>判别）</td> <td>Δ=</td> <td colspan="5"><input type="text" name="y0" class="outtext" readonly></td> </tr> <tr> <td>二次公式）</td> <td class="math"><i>x </i><sub><span style="font-size: 0.8em">1,2</span></sub> =</td> <td colspan="5"><input type="text" name="y3" class="outtext" readonly></td> </tr> <tr> <td>第一根：</td> <td class="math"><i>x </i><sub><span style="font-size: 0.8em">1 </span></sub> =</td> <td colspan="5"><input type="text" name="y1" class="outtext" readonly></td> </tr> <tr> <td>第二根：</td> <td class="math"><i>x </i><sub><span style="font-size: 0.8em">2</span></sub> =</td> <td colspan="5"><input type="text" name="y2" class="outtext" readonly></td> </tr> </tbody> </table> </form> <p>二次方程由下式给出：</p> <p class="math"><i></i><sup>2</sup> + <i>BX</i> + <i>C ^</i> = 0</p> <p> </p> <p>二次公式由下式给出：</p> <p> <img border="0" src="../../assets/math/algebra/quadratic_equation/quadratic_solution.gif" tppabs="https://www.titaotie.com/math/algebra/quadratic-equation/quadratic-solution.gif" width="211" height="49"></p> <p>判别是：</p> <p class="math">Δ= <i>b </i><sup>2</sup> - <i> </i> 4 <i>AC</i></p> <p> </p> <p>判别式为。</p> <p><img border="0" src="../../assets/math/algebra/quadratic_equation/quadratic_solution2.gif" tppabs="https://www.titaotie.com/math/algebra/quadratic-equation/quadratic-solution2.gif" width="153" height="50"></p> <p> </p> <div id="bottom-ad_2"> </div><hr> <h2>另请参阅</h2> <ul class="seealso"> <li><a href="../../math/algebra/quadratic-equation.html">如何求解二次方程</a></li> <li><a href="../index.html">在线计算器</a></li> </ul> <script src="../../assets/calc/calc2.js" ></script>  <div id="ban-ad"> </div>   </div> </div> <div id="rcol"> <p style="text-align: center;font-size: 13px;">广告</p> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-1832854270693044" data-ad-slot="6938384069" data-ad-format="auto" data-full-width-responsive="true"></ins>  <h5>数学计算器</h5> <ul> <li><a href="calculator.html">数学计算器</a></li> <li><a href="add-calculator.html">加法计算器</a></li> <li><a href="anti-log-calculator.html">反对数计算器</a></li> <li><a href="arccos-calculator.html">Arccos计算器</a></li> <li><a href="arcsin-calculator.html">Arcsin计算器</a></li> <li><a href="arctan-calculator.html">Arctan计算器</a></li> <li><a href="cos-calculator.html">余弦计算器</a></li> <li><a href="division-calculator.html">除法计算器</a></li> <li><a href="exponential-growth-calculator.html">指数增长计算器</a></li> <li><a href="exponent-calculator.html">指数计算器</a></li> <li><a href="factorial-calculator.html">阶乘计算器</a></li> <li><a href="fractions-calculator.html">分数计算器</a></li> <li><a href="ln-calc.html">Ln计算器</a></li> <li><a href="log-calculator.html">对数计算器</a></li> <li><a href="multiplication-calculator.html">乘法计算器</a></li> <li><a href="percentage-calculator.html">百分比计算器</a></li> <li><a href="pythagorean-calculator.html">勾股定理计算器</a></li> <li><a href="quadratic-calculator.html">二次方程求解器</a></li> <li><a href="root-calculator.html">根计算器</a></li> <li><a href="sin-calculator.html">正弦计算器</a></li> <li><a href="square-root-calculator.html">平方根计算器</a></li> <li><a href="subtraction-calculator.html">减法计算器</a></li> <li><a href="tan-calculator.html">正切计算器</a></li> </ul> <h5>快速表格</h5> <ul> <li><a href="mailto:?subject=无涯在线工具箱%20website&body=请查看这个网站:%20https://www.titaotie.com">推荐网站</a></li> <li><a href="#feedback">发送反馈</a></li> <li><a href="../../about/about.html">关于</a></li> </ul>  </div> </div> <div id="footer"> <a href="../../index.htm">首页</a>| <a href="../../web/index.html">网页</a>| <a href="../../math/index.html">数学</a>| <a href="../../electric/index.html">电力</a>| <a href="../index.html">计算器</a>| <a href="../../convert/index.html">转换器</a>| <a href="../../tools/index.html">工具类</a> <p>© 2026 <a href="../../index.htm">无涯在线工具箱</a> | <a href="../../about/about.html" rel="nofollow">关于</a>| <a href="../../about/terms.html" rel="nofollow">使用条款</a>| <a href="../../about/privacy.html" rel="nofollow">隐私政策</a>| <a href="../../about/cookies.html" rel="nofollow">管理 Cookie</a> </p> </div> <div id="banner"> <div> 该网站使用 Cookie 来改善你的体验，分析流量并展示广告。<a href="../../about/privacy.html">了解更多</a> </div> <div> <a id="banokbtn">确定</a> <a id="bansetbtn" href="../../about/cookies.html">管理设置</a> </div> </div>   </body>  </html>