安师联盟 2022年中考权威预测模拟试卷(五)5化学试题答案

安师联盟 2022年中考权威预测模拟试卷(五)5化学试题答案，目前答案易对网已经整理了安师联盟 2022年中考权威预测模拟试卷(五)5化学试题答案的各科答案和试卷，更多联考试卷请关注本网站。

书面表达Dear Teachers and StudentsIn order to reduce virus transmission, I'm here urgingyou to use serving chopsticks and serving spoons when youeat outAs the coronavirus has taken many lives, we ought toknow how to protect ourselves. Therefore, choosing ser-Ing tableware without hesitation is a perlect idea whendining together with others. The correct decisionwe make will undoubtedly cut down the route of the virustransmission, thus preventing ourselves from being infecPlease join me and work together. We will certainlymake the dining environment better!The Students' Union

22.解:本题考查网数的单调性和极值问题(1)由(x)-2hn-ar=2mx-ax-2x,其定义域为(o, ∞),可得∫(x)=2hx-a,令f(x)=0,得r=c当0 e时,∫(x)>0所以∫(r)在(0e)上单调递减,在〔e,十>)上单调递增所以f(x)要小=f(c2所以函数∫(x)的极小值为一2e,无极大偵.……………分(2)由<1可知1 n2,令t=x>1即证ht·,-<-2,即证h 2;-1>0,设M= 2c,则m- 2=3 =a-}故h(r)在(1,十~)上单调递增因而A(1)>h(1)=0,即lnt 2閃此结论成立.………………………12分