单项选择题

设曲线y=y(x)满足xdy+(x一2y)dx=0，且y=y(x)与直线x=1及x轴所围的平面图形绕x轴旋转所得旋转体的体积最小，则y(x)=( )

A． <img src="https://imgtest.ppkao.com/ExamPaperRes/2017/5/11/6b445fb9828e421fbd77041e72b6d020/482b45dc-7587-44a0-80ad-882fd1ae96e0.jpg">
B． <img src="https://imgtest.ppkao.com/ExamPaperRes/2017/5/11/6b445fb9828e421fbd77041e72b6d020/b5693a80-d999-4479-9fa1-00695df048ec.jpg">
C． <img src="https://imgtest.ppkao.com/ExamPaperRes/2017/5/11/6b445fb9828e421fbd77041e72b6d020/fd41fac1-8f52-49fe-b835-4ffe4d286d08.jpg">
D． <img src="https://imgtest.ppkao.com/ExamPaperRes/2017/5/11/6b445fb9828e421fbd77041e72b6d020/df705538-fc76-47e7-9820-7e1b20ae0419.jpg">

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单项选择题

{{*HTML*}}方程y 一3y +2y=ex+1+excos2x的特解形式为( )

A．{{*HTML*}}y=axe x +b+Ae x eos2x．
B．{{*HTML*}}y=ae x +b+e x (Acos2x+Bsin2x)．
C．{{*HTML*}}y=axe x +b+xe x (Acos2x+Bsin2x)．
D．{{*HTML*}}y=axe x +b+e x (Acos2x+Bsin2x)．

单项选择题

{{*HTML*}}设y1，y2是一阶线性非齐次微分方程y +p(x)y=q(x)的两个特解，若常数λ，μ使λy1+μy2是该方程的解，λy1一μy2是该方程对应的齐次方程的解，则( )

A． <img src="{$uploaddir}/644faf00-b96a-4a6c-adcf-c28642e3ac37.jpg">
B． <img src="{$uploaddir}/a7a50297-f71c-4b83-8ab8-e25f77b3d0ef.jpg">
C． <img src="{$uploaddir}/177f19ea-2313-4955-8dcd-483eaab1f130.jpg">
D． <img src="{$uploaddir}/88b597a2-8c85-4232-aa8e-4b990bb77fa7.jpg">