2-5 如图5,O为凸五边形ABCDE内一-|||-点,且 angle 1=angle 2 angle 3=angle 4 ,angle 5=angle 6 angle 7=-|||-angle 8.-|||-求证: angle 9 与 angle 10 相等或互补.-|||-A-|||-8-|||-E 10 B-|||-6 3,-|||-o-|||-52-|||-D C-|||-图5