|
ffi;I:tffi*# 2015#AErntfifff;**iatifr# 0)#
4ifrf*E: s22trFqKffi ,H'}}:tsgtl 4'ifrHtlsl:3zjtFf
( 6(t) , g,(t) r)lll#fr+,ftrtfiff6#. itrxrff, Sa(l) , sgn(r) rilrl*a-+,ir.Hxt+
drffi. ff++drff, s(t), u(t) VsXX.+,i",7FltSi&ff, ! r;; ! * ya#.?r4+trJAurtJil,,
!ar, ! 7
jg#z\�)|tffuHN-,lrr fHt{tfH{Z.MKg}..)
-, EAi;|-fffEc@4'fl&sh, )\7stl)
r. itg (t-"' + cost)d'(l)
l l a t / ^ , \ t
z. itffiJ--16'(2t
- 4)dt
t . Xfrsnfr\S:llt#urtifi ),ty,,(t)=/ (r)cos(2nt), ifrHWtAKliiffi+lt * ft'l*fltffiTq
1$+$,,ft"
4. R r-rr^ttiffi+4n.isiffiurf,riz/vh(t)=f e-,e(r), tfr,fiJWlr^furJififlIlx{t +rrt3Hls.
5. B*U/s=0,1, 2Ht,J(k)={l, 0.5,21,S,f&,fH),tArF2,3, 4, 5n'Jfft$ly-"(k)={A,
4, e, 4), &lfr.la)'t0. * mt6titfr\#{ilFtlJqa,Lfi"
6, J*u f (t) ft'lFourierN{Ht F(ja) , * f (3t-6)s-ttrffi Fouriertt9r"
r. t*F/r LrtKr;;trr'ifru611H(j@=ffi;, *1a,fr,tk1'f&hfit+.
g. * x(r)=sgn(r2- 9)ffiFourierA& "
e. * F (ja) = 2cos(za)frlFourieriu{f*'
ro. #/(/) H'fffiffi)JIA#.Ht00Hz,*/'(r) HtNyquistXt{'[frs"
Ir, rf If infEWntflHf HtrirgfirffrJ- A[t(m,fH� H!rnigf!J!E++H,! #ri "
tz. * cos(3t-2)e(3t-Z)ft1411Jt aplace4f4.
-.,rr*:.,,, r
EA&, F(s) =
(s+ 1Xs+ 4)
lJ' {\+ru LaPlaceJ
" s(s+ 2)(s+ 3)
riR.n&ffiFEiftl,n &'$# -Lfr,M ffirn(+!2m)
，更多更新年份持续更新，请在本站的考博信息网|www.kaoboinfo.com中的“考研试卷库”学校栏目中查询下载。
|
您现在的位置： 
