😃10.7 空間向量的外積

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

https://www.geogebra.org/m/p4z3txqv

向量的外積 https://www.geogebra.org/m/D5Ss9nG4

https://www.geogebra.org/m/htw3e4kq

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