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nguyentragiang35nb03
2 năm trước
Cho tam giác abc vuông tại a trung tuyến BM thuộc AC . Trên tia đối tia MB lấy N sao cho MN=MB. a) CM tam giác ABM=tam giác CMN. b) tính BN . biết AB=8cm,AC=12cm c) BC>CN.
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