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2 năm trước
Trên cùng một nữa mặt phẳng có bờ chứ tia Ox, vẽ hai tia Oy và Ot sao cho xOt=40 độ, xOy=120 độ. a; Trong 3 tia Ox,Oy,Ot tia nào nằm giữa? Vì sao? b; Tính yOt. c; Vẽ tia On là tia phân giác của xOy. Gọi Ox' là tia Ox. Chứng tỏ tia Oy là tia phân giác của x'Om.
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