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Maynguyen
2 năm trước
cho một vật AB vuông góc với trục chính của thấu kính hội tụ khoảng cách từ vật đến thấu kính là 30cm thấu kính có tiêu cự là 12cm chiều cao AB là2cm tính khoảng cách từ vật đến thấu kính và chiều cao của vâtj?
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