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1、衡水金卷先享题2022-2023学年度高三第一轮复习摸底测试卷B理综答案

2、衡水金卷·2022-2023学年度高三一轮复习摸底测试卷(老高考)理数B卷(一)1试题

3、衡水金卷先享题化学2022-2023高三一轮复习摸底测试卷

21.(1)f(x)=ln22ax+1+11分当a>0时,令g(x)=2ax2-x+1,其判别式为△=1-8a2分①当△≤0,即a≥8时,f(x)≤0,f(x)在(0,+∞)单调递减…3分②当△>0,即0

x2时,f(x)<0当x1
<x
0,…5分f(x)在(0,×1)上单调递减,在(x1,x2)上单调递增,在(x2,+∞)上单调递减6分(2)由(1)知,当且仅当a∈(0,)时,f(x)有极小值点x1和极大值点x2且x1+7分f(x1)+f(x2)n7-(nn1+lnn)-、l1)21)+(x1+x2)ln(x1x2)+-(x1+x2)+1=ln(2a)++1.8分令g(a)=ln(2a)++1,a∈(09分则当a∈(O)时()=2-=如1<0…10分g(a)在(O,8)单调递减分∴g(a)>g()=3-2ln2,即f(x1)+f(x2)>3-2ln212分
</x
</a<时,方程2ax2-x+1=0有两个不相等的正根8a1+√1-8a4分4a4c则当0<x

Yours sincerely,local lifestyles. And there are also plenty of museums where precious relics of historical inter-est are waiting for you to explore. Besides the exceptional Peking Opera performances thereare also what you can’t miss.I wish you a very happy and meaningful time in China!Li Hua

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