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2 năm trước
cho tam giác ABC cân tại. kẻ AI vuông góc với BC (Ithuộc BC) biết AB=10cm,AI=8cm a) tính BI b) kẻ IE vông góc voiAB (E thuộc AB) và CK vuông góc EI (K thuộc BC). Chứng minh tam giác BIE = tam giác CIK c)Chứng minh IK<BK+CK:2
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