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nguyenmanhhoang165
2 năm trước
Cho ∆ABC vuông tại A(AB<AC), đường cao AH(H thuộc BC) A) CM ∆HBA~∆ABC và BA²=BH.BC B)kẻ phân giác BE của AB (E thuộc AC), BE cắt AH tại I. CM∆HBI~∆ABE C)CM: AI=AE
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