Mathematics, 24.07.2021 02:50 jech3947
Cho tam giác AHB, đường caoHM lấy N thuộc tia đối tia HM, lấy K thuộc tí đối của tia HA Sao cho AH=HK. Chứng minh NK vuông góc HM tại N
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Cho tam giác AHB, đường caoHM lấy N thuộc tia đối tia HM, lấy K thuộc tí đối của tia HA Sao cho AH=H...
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