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congtru.4359
2 năm trước
Cho tam giác ABC ( A < 90 ° ) đường cao AH , về phía ngoài tam giác ABC dựng các hình vuông ABDE , ACFG . Trên tia đối của tia AH lấy điểm P sao cho AP = BC . Chứng minh rằng : a ) AC = EP ; AB = GP b ) Các đường thẳng AH , BF , CD đồng quy .
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