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dieuphuong057
2 năm trước
Cho ABC vuông tại A, AH  BC tại H a) Chứng minh HAB HCA  b) Chứng minh HA2 =HB.HC c) Lấy điểm D thuộc cạnh AB, điểm E thuộc cạnh AC sao cho DHE  90° Chứng minh DAH đồng dạng ECH d) Chứng minh DHE đồng dạng BAC >3 giúp mình vs nhanh nhất 5s nha
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