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camtu5519
2 năm trước
cho 2 tia Ox và tia Oy đối nhau. Lấy E thuộc Ox sao cho OE=4cm và F thuộc Oy sao cho OF=5cm a tính độ dài EF b gọi K Là trung điểm đoạn thẳng EF. tính KE KF KO c Lấy A thuộc Fy sao cho Af=2,5cm. tín ...
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