2021-2022高二英语周报第52期总第3655期答案

0.解:(1)出a=-1,得H(x)=-c2x+3ex-x,则H(x)=-2c2x+3ex-1=(ex-1)(-2e×+1).(1分)令H(x)=(c3-1)(1-2e)=0,解得x=0或x=(2=-1m2,(2分)则函数H(x)在(一∞,-ln2)上单调递减,在(一1n2,0)上单调递增,在(0,+∞)上单调递减,(3分)所以当x=-1n2时取得极小值H(-ln2)=ln2+当x=0时取得极大值H()=2.(5分)(Ⅱ)对Vx1∈[-1,1,3x2∈[-1,1,使f(x1)≥g(x2)恒成立,即f(x1)hm≥g(x2)m恒成(8分假设存在正数a,令f(x)=2ae2x-2aex=0,解得x=0,当x∈[-1,0)时,f(x)<0当x∈[0,1时,f(x)>0,所以当x=0时,f(x)取得最小值一a:(10分)而令g(x)=0,同理可得当x=0时,g(x)取得最小值g(0)=1,则一a≥1,解得a≤-1,与已知a>0矛盾,所以不存在满足条件的正数a(12分)

I used to live a life in my screen. I always check the time and read news. My bedtime routine washeckedcentered in my mabile phone. I looked through news websites and checked my email. When I woke up atmidnight, I did the same. The problem was that I felt anxiously every night. So when my friend invited meanxIousto the weekend camping without cell service in A countryside, I thought this was that I needed. Atthenight, I fell asleep listened to the songs of frogs and insects. In the morning, he woke up energetically.listeningSitting by the river and riding a bike, I enjoyed my time. Keeping away from my phone for 48 hours hasbeen changed my way of life

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