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3、2 A3A2 A4A2 B1A2 B2A3 A4A3 B1A3 B2A4 B155 60A4 B2B1 B2 .A1 B1A1 B2A2 B1A2 B2A3 B1A3 B2A4 B1A4 B2B1 B2 .50 6055 60MP M91535.1814(1)ACACBDO ,MOABCDOAC.3http:/ MOBMDBMDPDPDADABCDADABCDBADBCD60AB2ADPBD2AB2AD22 ABAD60MAB2AD22 AD2AB2AD2DNCOAB2AD2BD2ABADBDPDBDDPDPBDBDPBDADPBADPBPBDPBDCDNMNMNPDMN12PDPDMNABC
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7、2l1yy1x12( x x1 )y11 2x14yx12xy1 .P( x0 , y0 )l1,y0x12x0y1 .y0x22x0y2 .B( x1 , y1 ), C( x2 , y2 )y0x2x0y .B(x1 , y1 ), C( x2 , y2 )Ly0x2x0yA(2,3)PLyx 3 .y0x03 .8.http:/ 3yyx 3x 3C1C1(3,0) ,.PF1PF2AF1AF2P3LLyk x23y2xk x4 y23yx24kx8k120 .B x1 y1C x2 y2 ,x1x24k x1 x28k12 .x 24 y ,y1 2x4y12x .y1yC2x121
8、2x14xBy1y1 2x1 .2x12xl11 2x .4 1yy1x12( x x1 ),C2Cl2yx22x1 2x .4 2yx12x1 2x4 1xx12x22kyx22x1 2x4 2yx1 x242k3P 2k 2k3PF1PF2AF1AF2 ,PC1x 216y 21212k1622k12321903http:/ 212k30122473228014P.yf2 (x) kx 1 xx22x33kx,y1 x x2k( x2x k 1)x2xk10124 k134k .k340y( x2x k 1) 0yf2 ( x) kxRk34x2xk10x11324kx21324k.xx1
9、y0 xx1 x2y0 xx2y0yf2 ( x) kxx1x2x1 x2 .t1nNxfn ( x)0t t1n 1f1 ( x) 1 xf1 ( x) 1 xx 1xf1 ( x)0x 1 .n2fn ( x) 1 xx22x33x2 n 12n 1fn ( x)1 x x2x2nx2n 2 .10112(2222http:/ 01fn ( x)fn ( x)fn ( 1)1 0 ,(2n 1) 0x1x0fn ( x)x 2 n 1 1x 1,xx11x 1 0, x2nx 1 0, x2n1 0, fn ( x) 0 ,1 0, fn ( x) 0 ,fn ( x) 0f n ( x) (,)fn (1)(1 1) (1213) (1415)(12n 21)2n 10fn (2) (1 2) (222233) (244255)(22 n 22n 222 n 1)2n 11 (122 2 1)2 (3 42 4)2512n 2)22n2n 11fn ( x)1 22 301,23 44 52n 3(2n 2)(2n 1).22 n0x1fn xfn 10x2fn xfn 20nNxfn ( x)01 2.t1 .11
