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Mathematics, 16.09.2021 14:00 corrineikerd

cho hình chóp sacd có đấy là hình vuông canh a căn 2 sa vuông đáy sa =2a gọi h k lần lượt là hình chiếu của a lên sb sdmặt phẳng ahk cắt sc ở e tính thể tích sahek

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