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vuquynhvan71
2 năm trước
Cho Tam giác ABC nhọn có trực tâm H và nội tiếp đường tròn tâm O. Vẽ đường kính AK a,CM tứ giác BHCK là hình bình hành b, Kẻ OM vuông góc với BC ở M. Cm H, M, K thẳng hàng c,CM AH=2OM Cần mn giúp đỡ ạ. Cảm ơn ạ
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