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nguyenvinhanhquan
2 năm trước
M.n giúp em với ạ em sẽ đánh giá 5 sao ngày khi mn trả lời xong ạ Chiếu mộttia sáng lên một gương phẳng ta thu được một tia phản xạ tạo với tia tới một góc 40°. Góc tới có giá trị là A. 10° B. 20° C. 30° D. 40°
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