英语周报高二外研第45期2017 2018学年度答案

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!

23.解:(1)f(x)+|x+3≤6等价于|x-21+x+3≤6,x<-3,或!8x≤2或2-x-x-3≤6,9{-x+2+x+3≤6,>2(x-2+x+3≤6,解得一≤x<-3,或一3≤x≤2,或2z故原不等式的解集为x7∠x2(5分)(2)令g(x)=2ax+2a-1=2a(x+1)-1,所以g(x)的图象恒过点A(-1,-1),作出函数g(x)和f(x)的大致图象如图所示Ax)=r-21228(x)=2a(x+1)1当a=0时,g(x)的图象恒在f(x)图象的下方,符合当a>0时,结合图象可得f(2)≥g(2),解得0 <题意a≤a↓当a<0时,结合图象可得一≤a<010分)综上可知,实数a的取值范围为< p>

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