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lypt.tc3
1 năm trước
Cho hai đường thẳng x’x và y’y cắt nhau tại điểm O. a) Có bao nhiêu góc được tạo thành (không kể góc bẹt) b) Có bao nhiêu cặp góc kề và bù nhau? c) So sánh các góc xOy và x’Oy’ ; góc x’Oy và y’Ox.
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