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32019—2020!"#$!%%&'()*$+!,'-.!、"#$123456789101112DCBDACACCDCAy=x21.【!"】x2=4x-4,%x=2,y=4,&'A∩B={(2,4)}.{y=4x-42.【!"】(),CU(M∪N)={x-5<x<-3*3<x≤10}.3.【!"】A={3,5,7,9},B={x-1<x<8},A∩B={3,5,7},A∩B+,-./01223-1=7.5.【!"】f(1+x)=f(3-x)31f(x)=x2+bx+54562x=2,789:;.36.【!"】31g(x)=x+ax,x∈[-8,8]2<31,g(x)max+g(x)min=0,M=g(x)max+5,m=g(x)min+5,M+m=10.xx+17.【!"】=>31y=a4-2+5(a>07a≠1)?@AB,CDa>1.9.【!"】m2-m-1=1%m=2*m=-1,m2+m-3>0,Em=2.10.【!"】()&F.11.【!"】()&F.f(2019)=f(2019-4×505)=f(-1)=f(1)=1.12.【!"】31y=x2-2x+3GHx=145,&'g(x)=f(x2-2x+3)GHx=145.IJ231y=f(x)Kx∈R;LMNO,Py=x2-2x+3K[1,+∞)LMNO,&'g(x)=f(x2-2x+3)K[1,+∞)LMNO,?45QR>,g(x)=f(x2-2x+3)K(-∞,1]LMNS.书12>log3>1,1<log6=log26=log6=log6<log3,log0.03>log0.04=2,242222槡20.20.20.2log2<0,1-log2=log=log0.1,0.20.20.220.20.03log0.03-1=log=log0.15,log0.1>log0.15,0.20.20.20.20.20.2&'log0.2-1>log0.20.03-1>1>log23-1>log46-1.&'b<a<c<d.T、U-$13.【#$】(log23,2)∪(2,log25)【!"】J231y=f(x)VWX2(2,3)∪(3,4).&'2<2x-1<3*3<2x-1<4,Y3<xxx2<4*4<2<5,31f(2-1)+VWX2(log23,2)∪(2,log25).8114.【#$】-89281【!"】f(512)=f(29)==-.1-98-x2+5x-6,2≤x≤315.【#$】y={x2-7x+12,3<x≤4【!"】f(x)=-f(x+1)f(x+1)=-f(x+2),f(x)=-f(x-1)f(x)=f(x+2),f(x)=f(x-2).ZH0≤x≤1[,f(x)=x(1-x),\]x∈[2,3]^x-2∈[0,1],&'f(x)=f(x-2)=(x-2)[1-(x-2)]=-x2+5x-6.\]x∈(3,4],^x-3∈(0,1],f(x)=f(x-2)=-f[(x-2)-1]=-f(x-3)=-(x-3)[1-(x-3)]=x2-7x+12.-x2+5x-6,2≤x≤3&'31_`a2y=.{x2-7x+12,3<x≤4116.【#$】-!,(2]【!"】ba≤0[,f(a)≥221-a≥2a≤0,Ya≤0.11ba>0[,f(a)≥21-loga≥2loga≤-1a≤,Y0<a≤.22221c;,d1a+]Befg-∞,.(2]h、_i$17.(10j)(1)bx∈[0,+!)[,f(x)=-x2+4x,IJ2y=f(x)2<31,^\]x∈(-!,0)[,f(x)=-f(-x)=x2+4x,-x2+4x,x≥0&'f(x)=;(5j){x2+4x,x<0-x2+4x,x≥0,(2)Z(1)>f(x)={x2+4x,x<0,Z)R%,①bt+1≤-2,Yt≤-3[,31y=f(x)Kkl[t,t+1]LMNS;②b-2≤t,7t+1≤2,Y-2≤t≤1[,31y=f(x)Kkl[t,t+1]LMNO;③bt≥2[,31y=f(x)Kkl[t,t+1]LMNS.(10j)18.(12j)bx≥1[,f(x)=x2+2ax+a2-2LMNO,2a&'-=-a≤1,Ya≥-1,①(3j)2bx<1[,f(x)=9x-a2x+2LMNO,&'9-a2>0,Y-3<a<3,②(6j)1+2a+a2-2≥9-a2+2,_%a≥2*a≤-3,③(9j)]①②③+m/%a+]Bef2[2,3).(12j)19.(12j)a-1x2-2x+ax-1+>0,^>0,(1j)x-1x-1bΔ=4-4a<0,Ya>1[,x2-2x+a>0nop,x2-2x+a&'>0_/2(1,+∞),x-1a-1Y31f(x)=lgx-1++VWX2(1,+∞),(6