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tia sáng mặt trời chiếu xiên hợp với mặt ngang một góc 30 độ đến gương cho tia phản xạ có phương thẳng đứng hướng xuống dưới. Tìm góc hợp bỡi mặt gương và đường thẳng đứng

Sagot :

Can y’all pls give me sum food I’m not playing no games
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