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Ducthanh251220
2 năm trước
cho góc xOy = 30 độ . Từ điểm A trong góc xOy , vẽ tia \\ với Ox cắt Oy ở B và vẽ tia song song với Oy cắt Ox ở C a) tính góc xCA ; CAB b) tính góc ABy ; ABO kiếuuuuu
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