Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
证明所有 D^2 + E^2 - 4F > 0 的方程 x^2 + y^2 + Dx + Ey + F = 0 是圆。
证明所有 D^2 + E^2 - 4F > 0 的方程 x^2 + y^2 + Dx + Ey + F = 0 是圆。
Natural Language
Math Input
Extended Keyboard