2022 英语周报 高二 外研综合（OT） 12答案

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C1的普通方程为x+y=-1,即x+y+1=0.…2分因为曲线C的极坐标方程为=2sm(0+2)则p=2sin0+20s0,故p2=2psin+2aos0,即x2+y2=2y+2x,整理得(x-1)2+(y-1)2=2,所以曲线C2的直角坐标方程为:(x-1)2+(y-1)2=2.6分(2)由(1)知,曲线C2是以(1,1)为圆心,半径r=2的圆,又曲线C1与平面直角坐标轴的两个交点分别为A,B不妨设A(-1,0),B(0,-1),则|AB|=2因为圆心C:(1,1)到直线C1的距离为:d√2等21分所以直线C1与圆C2相离,点P到直线C1的距离的最小值为:8分所以△PAB的面积的最小值为,…1AB1(d-)-×号一10分

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