1、1-5ABBCC 6-8BAD 9.AB 10.ABD 11.BCD 12.ABD 184316. 521()40,iiyyyxxyyxyx1.92.3,yx8x1.9 82.317.5,yACBDFEF,E F,PC AC/ /EFPAPABDEEFBDE/ /PABDECDO,OP OBPDCPOCDPDCABCDPDC=ABCD CDPOABCD,OB OC OP, ,x y z2CD0, 1,0DC 0,1,0330,22DEBDE, ,nx y z00DE nDB n3302230yzxy1xPBBDE26sin13 sin0Ccos0A ABC0B 4 =AADBDDBA BCD
2、6 8 22sincos12 7cos7 10 BDCABD2BDC 4 3sin27 12 2011,23,nnnanaan 1n2113aa 2n32233aa 2n21223nnaa21n2211nnaa3 12111nnba2212123 12(1)42(1)2(1)nnnnaaab 111 1ba1nb12 1112nnb12121nna 012113521222221nnnaaaann 2211nnaa 24621352121 2nnnaaaaaaaann21321242()()nnnSaaaaaa1(21)(21 2 )232nnnnnn 1a1ln2xxxxf( ) 2g xf
3、 xx2ln(1)g xxxx1x0 , 1x0 xgxg0 , 1, 0 x0 xgxg, 000gxgxxf211222axaxxh24490aa01ahxh, a0 x0,xax0, 0 xfxhxf0,xa,0 xx0, 0 xfxhxf,0 xln1,xaxa22( )(1)21f xxxx axxaxfxxafxxf00 xf0ln0020axxx012ln0020 xxxxF01F012ln0020 xxx10 x0aAB1212yykxxAB11yk xxyOABmkxyAB:mkxyyx4222y042412222mkmxxk022121yyxx02212221212mxxkmxxkP00, yx4422162222212212221mmkxxxxxx2214212212222122212221xxxxyy0442122212211kkxxmxxkyxyx1242020yx22122SS
