英语周报 2018-2022 八年级 新目标 9答案

14.[命题立意]考查双曲线的标准方程及几何意义;考查逻辑推理,数学运算的核心素养[试题解析]不妨设B(0,b),F(c,0),由BA=2AF,得2cb、的。个双曲线C的方程可得9a-9=1,又|B|=√+c=4,c2=a2+b2,∴2c2-a2=16.②由①②,得a2=4,c2=10,∴b2=6,∴双曲线C的标准方程为一2=1.三[参考答案]4-5=1

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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