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anhgabbu155
2 năm trước
cho tam giác abc nhọn có hai đường cao AD và BE cắt nhau tại H a) C/m: Tam giác CAD đồng dạng tâm giác CBE b) C/m: HA.HD = HB.HE c) Tỉa CH cắt A-B tại K. C/m: góc AEK = góc ABC
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