2018考研数学二真题答案【福利年免费资源www.fulinian.com】.pdfVIP免费

2018考研数学二参考答案一、选择题1.B2.D3.D4.D5.C6.C7.A8.A二、填空题9.110.34xy11.2ln2112.3213.4114.2三、解答题15.解：xxxxdeedxee221arctan211arctanCeeeeCeeeeedeeeedeeeeedxeeeedxeeeeeexxxxxxxxxxxxxxxxxxxxxxxxxxxx121)1(611arctan2112)1(32411arctan21)1(111411arctan21111411arctan211411arctan21)1(112211arctan2123223222222216.20000200000122000'22200xxxtuxxxxxxxdxdxxxftdttfxtdtaxtfxtdtxufuduftdtxfuduufuduaxxfxfuduxfxxfxaxfxfuduaxxfxfxfxafxeaedxCeaeCf对两边对求导有：，当时，两边再对求导有：100111011022221212122212=1102xxCafxaaexfxfuduaxfftdtafaaeftdtaeftdtaeea当时，由得由又，大型考试资源分享网站百度搜索：华宇课件网http://www.china-share.com-更多热门考试学习资源免费下载--出售：公考、考研、会计、建筑、教师等考试课程-课程咨询微信QQ同号：582622214172002200220220223022230022340022|sin1cos1cos1cossin1cos1cossin1cos1cossin4sin1cos24siyxDyxxydxdydxxydyxyydxxyxyxdxtttttdtttttdttttdttdttttdttdtt222446000245600046262002462200n4sin2sincos8sin2222216sin16sinsin16sin22116sin16sin|16sin262816sin0032sin331163422tttttdtdtdtttttdtdtdtttdttdttdttdt25312642235182220,1ln2ln12ln2'100,110101ln2ln101ln2ln122ln'22ln22'11,2,'02,,'02222lxfxxxkxxkfxxxfxfxfxxxxkxxfxxxkxkxxfxxgxkxxxgxxxxgxxgxgxgk...