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vakhoa91
2 năm trước
Trên cùng một nửa mp bờ chứa tia Ox vẽ 2 tia OA và OB sao cho xOA =60 ; xOB 120 a) Tính số đo AOB ? b) Tia OA có là tia p/g của góc xOB ko? Vì sao? c) Vẽ Oylaf tia đói của tia Õ và Ot là tia p/g của yOB. Chứng minh BOt + BOA = 90
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