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ryenguyen129
2 năm trước
Cho tam giác ABC vuông tại A, AH vuông BC. Chứng minh rằng: a) AB^2=BC. BH AC^2=BC. CH b) AH^2=BH. CH c) AB. AC=BC. AH d) 1/AH^2=1/AB^2+1/AC^2 TỪ 4 Ý TRÊN RÚT RA 4 NHẬN XÉT GÌ????
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