📐 一元二次方程求解Quadratic Equation Solver
求解 ax²+bx+c=0，给出实数或复数根、判别式、顶点和对称轴。Solve ax²+bx+c=0 with real or complex roots, discriminant and vertex.
使用说明与常见问题How-to & FAQ
「一元二次方程求解」是什么？What is the Quadratic Equation Solver tool?
求解 ax²+bx+c=0，给出实数或复数根、判别式、顶点和对称轴。Solve ax²+bx+c=0 with real or complex roots, discriminant and vertex.
如何使用「一元二次方程求解」？How do I use the Quadratic Equation Solver tool?
在「一元二次方程求解」中，填写「a」、「b」、「c」等参数，结果会随输入实时计算并显示在下方。In the Quadratic Equation Solver: Fill in "a", "b", "c"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「一元二次方程求解」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Quadratic Equation Solver uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「一元二次方程求解」免费吗？需要注册吗？Is the Quadratic Equation Solver free? Do I need an account?
「一元二次方程求解」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Quadratic Equation Solver is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.