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2 năm trước
cho tam giác abc có tổng số đo góc B và C là 60,ke duong phan giac trong AD.Qua D kẻ DE vuông AB,DF vuông AC. a)DEF là tam giác gì? b)Qua C kẻ đường thẳng //AD,nó cắt AB tại M.Cm AM=CM c)Kẻ p/g góc ABC và góc ACB cắt nhau tại I.Cm A,D,I thẳng hàng d)Bt AM=a;CF=b.Tính AD(bt a>b)
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