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phamngocthanhthaokh
2 năm trước
Mặt cắt cổng vào một khu triển lãm co hình dạng 1 parabol y= -x mà trục đối xứng OH vuông góc với mặt đất . Biết bề rộng AB của cổng là 4m. Tính chiều cao HO của cổng?
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