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thuhang31
2 năm trước
Cho tam giác MPQ cân tại M. Trên PQ lấy K, trên tia đôia của QP lấy I sao cho PK bằng QI. Từ K kẻ EK vuông góc PQ (E thuộc PM). Từ I kẻ IF vuông góc PQ (F thuộc MQ. a) CM EK bằng FI b) CM PQ đi qua trung điểm EF c) CM EK + IF< EF
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