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{MPLTEXT 1 0 41 "d2tU(x,p):=laplace(diff(u(x,t),t$2),t,p);" }}{PARA 
11 "" 1 "" {XPPMATH 20 "6#>-%%d2tUG6$%\"xG%\"pG,(*&)F(\"\"#\"\"\"-%(la
placeG6%-%\"uG6$F'%\"tGF4F(F-F---&%\"DG6#F,6#F26$F'\"\"!!\"\"*&F(F--F2
F;F-F=" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 24 "\307\340\357\350\370
\345\354 \352\360\340\345\342\373\345 \363\361\353\356\342\350\377 " }
}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 78 "\340) \355\340\367\340\353\374
\355\373\345 \363\361\353\356\342\350\377, \352\356\362\356\360\373
\345 \347\340\357\350\370\345\354 \361 \357\356\354\356\371\374\376 \+
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\345\354\340\355\362\350\352\363 " }}{PARA 0 "" 0 "" {TEXT -1 11 "\357
\356\361\353\345\344\355\345\343\356:" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 68 "u(x,0):=A*sin(Pi*x/L); convert(D[2](u)(x,0),diff); D[
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{XPPMATH 20 "6#-%%evalG6$-%%diffG6$-%\"uG6$%\"xG%#t1GF-<#/F-\"\"!" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#>--&%\"DG6#\"\"#6#%\"uG6$%\"xG\"\"!F.
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{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "`u(0,t):=2; u(L,t):=0;`:" }}
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\345\342\373\345 \363\361\353\356\342\350\377 \342 d2tU(x,p)" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "eval(d2tU(x,p));" }}{PARA 
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}{EXCHG {PARA 0 "" 0 "" {TEXT -1 75 "\302\345\360\355\345\354\361\377 \+
\352 \344\350\364\364\345\360\345\355\366\350\340\353\374\355\356\354
\363 \363\360\340\342\355\345\355\350\376 du \350 \347\340\357\350\370
\345\354 \345\343\356 \342 \356\357\345\360\340\362\356\360\355\356
\354 \342\350\344\345:" }}{PARA 0 "" 0 "" {TEXT -1 28 "   d2U(x,p)-d2t
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\353\350 \316\304\323 \356\362\355\356\361\350\362\345\353\374\355\356
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{TEXT 260 1 "\365" }{TEXT -1 1 " " }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 41 "du0:=subs(laplace(u(x,t),t,p)=Up(x),duo);" }}{PARA 
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54 "\315\340\351\344\345\354 \360\345\370\345\355\350\345 \357\356\353
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{EXCHG {PARA 0 "" 0 "" {TEXT -1 80 "*) \310\353\350, \363\367\350\362
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\361\353\345\344\363\345\362 \355\340\351\362\350, \342 \352\356\355
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