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heo.beautiful2k1
2 năm trước
Cho tam giác ABC. Gọi I là điểm nằm trong tam giác và cách đều ba cạnh của tam giác đó. Qua I kẻ đường thẳng song song với BC cắt AB, AC lần lượt tại E và F. Chứng minh EF = BE + CF. Xin các ông đi qua các bà đi lại hãy dừng chân giúp đỡ nhok con này 😥😥😥
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