Mathematics, 16.09.2021 14:00 boonkgang6821
Cho tam giác ABC nhọn, trực tâm H , trên đoạn BH lấy điểm M và trên đoạn CH lấy điểm N sao cho góc AMC=goc1ANB=90 độ. Chứng minh rằng AM=AN
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Cho tam giác ABC nhọn, trực tâm H , trên đoạn BH lấy điểm M và trên đoạn CH lấy điểm N sao cho góc A...
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