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2 năm trước
Cho tam giác ABC có góc A < 90°. Vẽ ngoài tam giác ABC tam giác vuông cân đỉnh A là MAB, NAC. a, Chứng minh: MC = NB b, Chứng minh: MC vuông góc với NB c, Giả sử tam giác ABC đều cạnh 4cm +Tính MB;NC +Chứng minh: MN//BC
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