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minhtrumtruonghtt
2 năm trước
Bài 3: Cho hình bình hành ABCD có AB = 6cm, BC = 5cm. Lấy F trên cạnh AD sao cho DF = 3cm. Tia CF cắt tai AB tại G a) Chứng minh GAF đồng dạng CDF và GBC đồng dạng CDF b) Tính độ dài đoạn thẳng BG. c) Chứng minh AD.FC = GC.FD d) GB.DF = BC. AB
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