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	Các bình luận về: Cho lăng trụ đứng ABC.A&#039;B&#039;C&#039; có đáy là tam giác vuông cân đỉnh A,AB = AC = a,AA&#039; = acăn 2 . Diện tích mặt cầu ngoại tiếp tứ diện CA&#039;B&#039;C&#039; là:	</title>
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