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21-12-2022
Mathematics

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cho tam giác ABC nhọn có trực tâm H . Các đường vuông góc với AB tại B và vuông góc với AC tại C cắt nhau tại D a, C/M : BDHC là HBH . b, C/M: ^BAC+^BHC=180 c, C/m 4điểm A,B,D,C cách đều

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