Ciu J2 (Jdiem): Cho Uam giic ^HSC' nhon €o Al AC'. (ii M la Irunu diem tun AC. Tren tia doi cua tia MB Iiy diem [) sao cho MD MI} a) Chirng minh ABMC = ADMA b) Ve AH 1 BC (M e BC) _ Churng minh; AI 1 AD c) Ve CK 1 AD (K € AD) . Chumng minh: BH K d) Chirng minh ba diem I,M, K thang hing