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maichixg2
2 năm trước
cho tam giác abc có đường cao ah . trên ah , lấy các điểm k , i sao cho ak = ki = ih . qua i , k lần lượt vẽ các đường thẳng ef // bc , mn // bc ( e/m thuộc ab , f , n thuộc ac ) tính mn/bc và ef / bc Ai chơi nro kb mình nha zl 0865660582 ahihhi :))
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