cho hình thang cân ABCD,d là đường thẳng đi qua trung điểm 2 đáy. Cmr: a, hai đường chéo cắt nhau tại 1 điểm trên d b, hai đường phân giác của 2 góc kề đáy cắt nhau tại 1 điểm trên d

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