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2 năm trước
Cho hình thoi ABCD có góc A=60 độ.Qua C kẻ đường thẳng d cắt các tia đói BA và DA theo thứ tự tại E và F . Chứng minh : a,EB/BA =AD/DF b,Tam giác EBD đồng dạng với tam giác BDF c,góc BID = 120 độ CM cho mk câu a thôi
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