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N

ngoxuanquy

goi M la TĐ cua CD tgACD can o A nen AM vuong goc CD,tg BCD can o B nen BM vuong goc CD
mp(ABM) vuobg goc CD KE AH vuong goc BM suy ra AH vuong goc CDsuy ra AH vuong goc(BDC).vay dg cao AH cat AM. TINH ah PHAN BAN
 
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