共50条信息
如图,在空间四边形\(ABCD\)中,\(E\),\(F\)分别是\(AB\),\(AD\)的中点,\(G\),\(H\)分别在\(BC\),\(CD\)上,且\(BG:GC=DH:HC=1:2\).
\((1)\)求证:\(E\),\(F\),\(G\),\(H\)四点共面;
\((2)\)设\(EG\)与\(HF\)交于点\(P\),求证:\(P\),\(A\),\(C\)三点共线.
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