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chauanh
2 năm trước
cho tam giác abc có ba góc nhọn. gọi h là trực tâm của tam giác abc, qua b kẻ bx vuông góc ab, qua c kẻ cy vuông góc ac. gọi giao điểm bx và cy là d. cm 1. bhcd là hbh 2. gọi i là trung điểm của ad. cm ib=ic 3. tìm điều kiện của tam giác để tứ giác bdch là hcn; vẽ hình nữa nha
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