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定理在△ABC中,若(AB|→)=(x1,y1),(AC|→) =(x2,y2),△ABC的面积S,则应用上述定理可简便地处理一类与三角
Theorem in △ABC, if (AB|→)=(x1,y1),(AC|→)=(x2,y2), the area S of △ABC, the above theorem can be used to easily deal with a class of triangles.