1、 202012 512+i12i A 35i D35i C i B i2 y=f(x)y=f(x)A f(x)1 1 D f(x)2 1 C f(x)2 3 B f(x)3 23 f(x)=xlnx f(x0)=2 x0=A e2 D ln2 Cln22 B e4 A a=4 D a=7 C a=6 B a=55 y=2x2ln2x A(0,12)D(12,0)(0,12)C(12,+)B(0,24)6 1000 1 2 1000100 46 4 A 8 D 815 C 616 B 2007 A16 D12 C13 B14 1,_._._._.8 y=f(x)y=f(x)y=f(x)y=f(x
2、)9 0 x1 x2 lnx2lnx1 D x2ex1 x1ex2 B ex2ex1 x1ex210 y=ln(2x1)2xy+8=0 A 1 D 3 5 C 2 5 B 511 f(x)=x3+ax2(1,+)a A(3,+)D(,3)C(3,+)B 3,+)12 y=xn+1(n N*)(1,1)x xnx1 x2 xn A1n D 1 Cnn+1 B1n+14 5 2013 z|z+1i|=1|z|=14 y=ax2+bx+k(k 0)x=0 y=f(x)(1,f(1)x+2y+1=0 a+b15 1 2 3 416 6 7 8 8 9 10 2yx Oyx Oyx Oyx OA B C
3、 D.6 7017 1050 50,95mm995 0 749 8 8 8979787867676656554553321290 02814 6 738363 015943(1)80,85)85,90)680,85)85,90)(2)(1)6 2 85,90)18 12 a R f(x)=ax33x2x=2 y=f(x)(1)a(2)y=f(x)1,519 12 6 5 9 6 34 3 Y/5 3 17 5 x/5 3 24 2(1)Y x(2)6 11 b=ni=1xiyin x y ni=1x2in x2=ni=1(xi x)(yi y)ni=1(xi x)2 a=y b x 3.20 12 50 m35050 5 9 2 10.6,0.7)0.4,0.5)0.2,0.3)0,0.1)26 4 30.5,0.6)0.3,0.4)0.1,0.2)50 16 13 10.4,0.5)0.2,0.3)0,0.1)5 10 50.5,0.6)0.3,0.4)0.1,0.2)(1)50(2)0.35(3)36521 12 f(x)=lnx+ax2+(2a+1)x(1)f(x)(2)a 0 f(x)34a222 12 f(x)=ax2+x1ex(1)y=f(x)(0,1)(2)a 1 f(x)+e 0 4 4
