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!

15.(0,2]【解析】由题意可得5,=4S-(n≥2),S12a·2a=4a,所以数列{Sn}是首项为Sy442,公比q=的等比数列设T,=S1+S:+S+Sn,易知T。单调递增,又1-q″∈(0,1),所以7,a1(1-q")了Q√31-13a,所以Tn32,所以③3a2543又a>0,所以a∈(0.2]

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