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thanh10082003
2 năm trước
Hai gương phẳng quay mặt phản xạ vào nhau và hợp với nhau một góc 200. Chiếu một tia sáng tới một trong hai gương theo phương song song với đường phân giác của góc hợp bởi hai gương. Xác định đường đi của tia sáng.
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