<iframe height="1114px" scrolling="no" src="https://www.geogebra.org/material/iframe/id/nvubwwzg/width/2528/height/1114/border/888888/sfsb/true/smb/false/stb/false/stbh/false/ai/false/asb/false/sri/false/rc/false/ld/false/sdz/false/ctl/false" style="border: 0" title="形如Ax^2+Bxy+Cy^2+Dx+Ey+F=0的圆锥曲线" width="2528px"> </iframe>
标签:Bxy,Cy,Ey,Dx,Ax,圆锥曲线 From: https://www.cnblogs.com/xuebajunlutiji/p/17813752.html