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Cho tam giác ABC vuông tại A.Gọi I là trung điểm của BC.Trên tia đối của IA lấy điểm D sao cho ID=IA. a,Chứng minh : Tam giác BID=tam giácCIA b,Chúng minh:BD vuông góc AB c,Qua điểm A kẻ đường thẳng //BC , cắt đường thẳngBD tại M . Chứng minh tam giác BAM=tam giác ABC d, Chứng minh AB là tia phân giác của góc DAM
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