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cho hình chóp S.ABCD có đáy ABCD là hình vuông cạnh a. Biết SA ⊥(ABCD) và SA=a. Thể tích của khối chóp S.ABCD là A. a ³ √3 B. a ³/4 C. a ³ D. a ³/3 giúp mik giải với ạ
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