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	Các bình luận về: Cho hình hộp chữ nhật ABCD.A&#039;B&#039;C&#039;D&#039;  có AB = a, AD = 2a, AA&#039; = 3a . Thể tích khối cầu ngoại tiếp hình hộp chữ nhật ABCD.A&#039;B&#039;C&#039;D&#039; là	</title>
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