duongdao1801 duongdao1801

22-07-2021
Mathematics

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Cho xOz ‘ và yOz ‘ là 2 góc kề bù. Gọi Ot là phân giác của yOz ‘. Biết xOz ‘ = 50◦ , tính xOt

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singhmonu2109 singhmonu2109

26-07-2021

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