Mathematics, 28.07.2021 07:50, rhettperkins

Cho tam giác ABC vuông cân tại A; D thuộc AB, E thuộc AC và AD bằng AE, qua A, D kẻ đường thẳng vuông BE cắt BC tại I, K gọi H là giao điểm của KD và CA chứng minh: AH bằng AB, IK bằng IC

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Cho tam giác ABC vuông cân tại A; D thuộc AB, E thuộc AC và AD bằng AE, qua A, D kẻ đường thẳng vuôn...