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bntaodaica
2 năm trước
cho tam giac ABC ⊥ tai A co goc B = 60 do. AB=5cm tia phan giac goc B cat AC tai D . Ke DE ⊥BC tai E a) Chung minh tam giac ABD = tam giac EBD b) Chung minh tam giac ABE la tam giac deu c)Tinh do dai canh BC
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