😀11.3 矩陣

https://www.geogebra.org/m/daz9grnr#material/qupws8qz

https://www.geogebra.org/m/daz9grnr#material/w9czpbut

https://www.geogebra.org/m/daz9grnr#material/cgvhngb5

https://www.geogebra.org/m/asnzgnfc