书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

22.解:(1)曲线C的直角坐标方程为y2=4x,直线l的普通方程为x-y-2=0……5分√2+t(2)直线l的参数方程可化为(t为参数)代入曲线y2=4x得:r2-4√2-16=0,设A,B两点所对应参数分别为4,t2,则+l2=42,42=-16,P4+P8=148=k-4=√+42)-4/2=46……10分

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