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笔者在文[1]中给出了下面两个定理.定理1已知点M是不在△ABC三边所在直线上的一点,直线BM,CM分别交直线AC,AB于点E,F.若AF→=λ1FB→,AE→=λ2EC→,则AM→=λ1AB→+λ2AC→/1+λ1+λ2.定理2已知点M是不在四面体A-BCD的四
The author gives the following two theorems in [1]: Theorem 1 Known point M is not a point on the line where △ ABC is on three sides, and lines BM and CM are respectively AC and AB at points E and F. If A → → λ1AB → + λ2AC → / 1 + λ1 + λ2 Theorem 2 It is known that M is not tetrakis