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haonii1102
2 năm trước
một vật sáng AB đặt trên trục chính của thấu kính hội tụ có tiêu cự bằng 20cm cho ảnh A phẩy B phẩy là ảnh thật cách vật khoảng 80 cm cạnh a phẩy b phẩy cách thấu một khoảng bằng bao nhiêu.
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