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ngocanhlethi2602
2 năm trước
Cho tam giác ABC có góc A<90 độ. Vẽ ra ngoài tam giác ABC các tam giác vuông cân tại A là tam giác ABM và tam giác ACN. a, Chứng minh rằng: tam giác AMC= tam giác ABN b, Chứng minh: BN vuông góc với CM c, Kẻ AH vuông góc với BC( H thuộc BC). Chứng minh AH đi qua trung điểm MN Cho ba số a, b, c thỏa mãn 0 ≤ a ≤ b + 1 ≤ c + 2 và a + b + c = 1. Tính giá trị nhỏ nhất của c làm hết nhé
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