Physics, 31.10.2021 22:30 veraanna2015
một cái cây mọc thẳng đứng ở bờ ao. Cây cao 1.2m, gốc cây cách mặt nước 50m. Một người quan sát ảnh của vật thì ngọn cây cách ảnh của nó là bao nhiêu?
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một cái cây mọc thẳng đứng ở bờ ao. Cây cao 1.2m, gốc cây cách mặt nước 50m. Một người quan sát ảnh...
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