2010-2022 英语周报答案

21.(12分)解:(1)g(x)的定义域为(0,+∞),I-axg(x)>当a≤0时,g'(x)>0恒成立,所以,g(x)在0,+∞)上单调递增2分当a>0时,令g(x)=0,得到x所以当x∈(0,-)时,g'(x)>0,g(x)单调递增,当x∈(-,+∞)时,g'(x)<0,g(x)单调递减,综上所述当a≤0时,g(x)在(0,+∞)上单调递增当a>0时,g(x)在(0,-)上单调递增,在(一,+∞)上单调递减3分(2)记函数o(x)=e2-hx=-lhx,则q(x)4分x易知φ(x)在(0,+∞)上单调递增,又由q(1)<0,q(2)>0知,q(x)在(0,+∞)上有唯一的实数根x0,……6分且1<<2,则q(x)=e2\=0,即e2=(*),当x∈(0,x0)时,φ(x)<0,(x)单调递减:当x∈(xo,+∞)时,φ(x)>0,φ(x)单调递增,所以o(x)≥(x0)=e2-mx,结合()式eh?),知-2=-hx,………10分所以叭(x)29)=2+x1-2=52-2+1(x-1)>0,11分则o(x)=e2-lnx>0,即e-2>hx,所以有f(x)

读后续写Possible version lI stared at the paper and then looked around. I was cold. Although I could not see my sistersnor the new house, which was hidden from my sight by a grey wall, I got the feeling that I was notalone. Walking along the shore was a tall familiar figure who looked lost in his thoughts. I lookedgain at the paper in my hand, closed my eyes and wishedAs /opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. I smiled up at him and took his hand. Looking back, life fromthat day on marked the start of a close bond and a strong friendship with my father. What was mybirthday surprise? Wishes do come truePossible version 2I stared at the paper and then looked around. On the backside, there was a map. I noticed thatit was clearly leading me in a direction, but who could have sent this? I stood there in silence andstudied it. I decided to follow the map and it led me down the beach until I reached a staircase. Iooked back and could no longer see my siblings. I continued to follow the point on the map, untilI unexpectedly lost my footing and fell zksq down the stepsAs I opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. Then he asked how I had come upon this place? I explained tohim that I had found the bottle in the ocean and when I opened it had the words on it. Shocked bythe message, my father realized what I had found I threw this bottle into the ocean many years agowhen I was alone. he said. I used to come to this exact place to get away from everyone else. NowI get to share this experience with you. What a birthday surprise

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