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arthurkirkland07098
2 năm trước
Cho hình bình hành ABCD có góc B = 90°.Qua B kẻ đường thẳng vuông góc với AC tại O và cắt AD tại E. a, Chứng minh OA.OB = OC.OE b, Cho BC=5cm, AE=2,5cm, AC=6cm. Hãy tính OA, OC c, Chứng minh rằng BC.AG = AC.OC d, Chứng minh rằng AB.À = AC.AO e, Gọi F, G lần lượt là chân đường thẳng AB, AD. Chứng minh AB.AF + AD.AG = AC^2
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