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quyynhanhhng2313
2 năm trước
Cho tam giác ABC vuông tại A . BI là phân giác ^ABC . Kẻ ID vuông góc BC tại D a ) CM : tg ABI = tg DBI b ) CM : ID < IE và IC = IE c ) Tam giác ABC cần có thêm điều kiện gì để I cách đêu bà đỉnh của tam giác
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