The World Olympic Mathematical Competition, or WMO for short, is the only official organization in China (Education Development Center of China Committee for the Care of the Next Generation). The national finals are held twice a year. In winter and summer, the players in the national finals are selected by the outstanding players in the preliminary and semi-finals of each division to participate in the national finals. Players who won the gold and silver medals in the national finals, after unified and closed training by the national training team, achieved excellent results and can successfully advance to the global finals.
The main participants are from grade three to grade nine. Players participating in the global competition must be over 65,438+00 years old to successfully go abroad to participate in the global competition. If you are qualified for the global competition, but you are not old enough, the corresponding qualification can be reserved for the next global competition.
As shown in fig. 3, point D moves on line segment OB (except endpoints O and B), and a straight line AB intersects with DE¡ÍCD at point E, that is, AB¡Íx axis.
<