2022英语周报仁爱版九年级答案

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!

21.解:(1)由题意可知,命题p为真命题由集合M={x|kx2-2kx+1=0,x∈R)为空集,得方程kx2-2kx+1=0没有实数解,所以当k=0时,方程变为1=0,故无解,符合题意;当k≠0时,Δ=4k2-4k<0,即0 0的解集为R,得△=(k-1)2-16<0,解得-3

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