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kieuhs2
2 năm trước
Trên cùng một nửa mặt phẳng bờ Oy vè tia OC,OA sao cho yOc=60°,yOa=120°. Vẽ ox là tia đối của tia oc. a, tia oc có nằm giữa hai tia OY, OA không? Vì sao. b, tính góc aOC vag chúng tỏ oc là tia phân giác của góc yoa.
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