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mklatrang
2 năm trước
câu1:Số hs của trg THCS Tích Sơn trong khoảng từ 1000 đến 1200 em. khi tập thể dục nếu xếp số hs đó thành 5 hàng, 29 hàng, 8 hàng thì thừa ra 2 e. Tính số hs của trg câu2 trên tia Ox lấy hai điểm A và B sao cho OA=4cm,OB=8cm a)tính độ dài đoạn thảng AB b)chứng tỏ A là trung điểm của OB c)gọi P là trung điểm của đthẳng OA, Q là tđiểm của đthẳng AB. Chứng tỏ OB=2.PQ ai giúp mik vs mik xin đó
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