Cho ∆ ABC = ∆EFG. Viết các cạnh bằng nhau. Hãy viết đẳng thức dưới một vài dạng khác? Giả sử góc A=58°;góc F=75°; AB=4cm; BC=5cm; EG=7cm. Tính các góc còn lại và chu vi của hai tam giác?

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