2022 英语周报 八年级 新目标31答案

22.【解析】(I由(t为参数),消去参数t,可得x 3y-1=0.p=4cos0,∴p2=4pcos,即x2 y2-4x∴曲线的直角坐标方程为(x-2)2 y2=4.,(Ⅱ)把代入x2 y2-4x=0,得12 3t-3=0设A,B两点对应的参数分别为t1,t2,则t1 t2=-3,t1t2=-3因为直线l经过点P(1,0),则|AB|=||PB|-|PA2-t1(t1 t2)2-4tt2=√15

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!

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