精选优质文档-倾情为你奉上一、计算题1.解:y=(e-x2 )+(cos2x)=-x2e-x2-2sin2x=-2xe-x2-2sin2x综上所述,y=-2xe-x2-2sin2x2.解:方程两边关于x求导:2x+2yy-y-xy+3=0(2y-x)y=y-2x-3 , dy=y-3-2x2y-xdx3.解:原式=2+x2d(12x2)=122+x2d(2+x2)=13(2+x2)32+c。4.解:原式=2xd(-cosx2)=-2xcosx2+2cosx2dx=-2xcosx2+4sinx2+c5.解:原式=12e1xd-1x =-e1x|12=-e12+e。6.解:1elnxd(12x2)=12x2lnx1e-1e12x2(lnx)dx=12e2-14x21e=14e2+147.解:I+A=-20 I+A,I=01-2000101-2000100-2-50-11100-106-5010-53-30012-11(I+A)-1=-106-5-53-32-11 8.解:(AI)=12-