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2 năm trước
Cho đường thẳng d và hai điểm A B nằm cùng phía so với đường thẳng d. Gọi C là t điểm A, B, kẻ AA1, BB1, CC1 vuông góc với đường thẳng d ( A1, B1, C1 thuộc d ). Biết A1-16cm, B1-20cm. Khi đó: CC1-.....cm.
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