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quang4gdk123
2 năm trước
cho góc xoy và x'o'y' có ox vuông góc o'x',oy vuông góc o'y' a,nếu góc xoy và x'o'y' đều nhọn thì chúng bằng nhau b,nếu 1 trong 2 góc xoy x'o'y' có 1 góc nhọn góc còn lại tù thì chúng bù nhau
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