1.从右往左，自上而下，依次穿根
<iframe height="600px" scrolling="no" src="https://www.geogebra.org/material/iframe/id/pbyzz3m5/width/2529/height/1115/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="序轴穿根法1" width="800px"> </iframe>
2.奇穿偶返
<iframe height="600px" scrolling="no" src="https://www.geogebra.org/material/iframe/id/fahvremc/width/2529/height/1115/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="序轴穿根法2" width="800px"> </iframe>标签：穿根,奇穿,高次方程,标准,偶返,从右 From： https://www.cnblogs.com/xuebajunlutiji/p/16772914.html