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nguyenvuminhtam2007
2 năm trước
Cho tam giác ABC, lấy M trên cạnh BC sao cho MB/MC=1/2 . Qua M kẻ đường thẳng song song với AC cắt AB tại D. Qua M kẻ đường thẳng song song với AB cắt AC tại E a) Tìm các cặp tam giác đồng dạng và tìm tỉ số đồng dạng b) Tính chu vi các tam giác DBM, EMC biết chu vi tam giác ABC bằng 24 cm GIÚP MIK VS CÁC CẬU, MIK VOTE 5 SAO ^.^( BÀI KIA BỊ LỖI R)
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