河南省许平汝九校联盟2022年高考数学考前最后一卷预测卷含解析

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20ூt௃(1)ᵫxZFGyᦪ/(X)Ḅ?@A{(0,+8),f(x)=2x—21nx—2,/z(x)=/'(x),ᑣᨵ/?'(x)=2"I),ᵫ"(x)=0,FGx=l,XFZXᓄ"(x),஻(x)Ḅᓄ᝞⊤X(0,1)1(l,+8)-0+᩽/.-./z(x)>/z(l)=O,ᓽr(x”0,FG/(x)ᙠ*+(0,+)ᓫ.⌴0;(2)ᵫxZFGyᦪg(x)Ḅ?@A{((),+8),g'(x)=l—£-[ᵫxZGg'(x)=O,ᓽᐸS2¤olnXo-a=O,জᵫ8()=2FG%o-x(Inx)2-2x+a=0,ঝ000ὶKজঝmª஺FG2X(.—(«/)2-2T—2=0,ঞ(x)=2x-(lnx)2-21nx-2,®1(x)=2---------=------------,XXXᵫপZx-lnx-l>0,ᦑf'(x)20,•••1±)ᙠ*+(0,+8)ᓫ.⌴0,²³ᑮµ1)=0,ᡠ·Wঞᨵ¸SQ=1,¹ᐭজFG஺=1,"o=1,஺=11(3)67ᵫ(1)Z/(x)=f-2xlnxᙠ*+(0,+8)ᓫ.⌴0ᦑ/(x)>/(l)=l,g(x)=1!251nB=⌕¾ு0,XXFGg(x)ᙠ*+(1,+8)ᓫ.⌴0,\2ÁÂx>lg(x)>gপ=2,ᓽx+J—(lnx)2>2,Äᓽ—Å2>(Inx)I7Æ--r=>0,Inx>0,ᦑFGVx—~r=>Inx,bx=2k+l,kwN*,2k

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