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f(x)=a:3+21、(1)解：由题意函数3”为偶函数，f()=f),即a3+3”=a3”+3:a-3-3)=0对任意xeR恒成立，解得a=1.:)=3+任取05，则))-+=(6-1-5)6-3)39到由0
第二节书面表达De[文]ar Tom,I feel sorry to know your grades have been plunging.[章]But it's not time for you to feel desperate[来].I believe youcan find yourself back by taking action.It[自] is your pride and laziness that should take theblame.[知]But on the bright side,mist[嘛]akes nourishes[答]one's mind and breeds success.I[案]t's never too late tochange.[网]Here is how.First[文],review the lessons thatyou have missed recently by comparing[章] notes withpeers[来].In addition,[自]it's necessary[知] for you to make aproper study plan which you can keep up.Never forgetwhy[嘛] you started,a[答]nd your mission can be accomplis[案]hed.I hope you could feel better and get your academicp[网]erformanc[文]e improved.[章]Yours sincerely[来],Li Hua
