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baominh140803
2 năm trước
cho tam giác ABC,AB lấy điểm I,trên AC lấy điếm K sao cho : Góc ACI=Góc ABK .Sao cho : a)Chứng minh rằng IA.AB =AK.AC b) chứng minh tam giác AIK S(S nằm ngang)bằng tam giác ACB
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