请教一个矩阵的问题
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 12pt;"><font face="宋体">若</font></span><span lang="EN-US"><span style="POSITION: relative; TOP: 5pt; mso-text-raise: -5.0pt;"><shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" opreferrelative="t" ospt="75" coordsize="21600,21600"><font size="2"><font face="宋体"><stroke joinstyle="miter"></stroke><formulas><f eqn="if lineDrawn pixelLineWidth 0"></f><f eqn="sum @0 1 0"></f><f eqn="sum 0 0 @1"></f><f eqn="prod @2 1 2"></f><f eqn="prod @3 21600 pixelWidth"></f><f eqn="prod @3 21600 pixelHeight"></f><f eqn="sum @0 0 1"></f><f eqn="prod @6 1 2"></f><f eqn="prod @7 21600 pixelWidth"></f><f eqn="sum @8 21600 0"></f><f eqn="prod @7 21600 pixelHeight"></f><f eqn="sum @10 21600 0"></f></formulas><path oconnecttype="rect" gradientshapeok="t" oextrusionok="f"></path><lock aspectratio="t" vext="edit"></lock></font></font></shapetype><shape id="_x0000_i1025" oole="" type="#_x0000_t75" style="WIDTH: 167.25pt; HEIGHT: 18pt;"><imagedata otitle="" src="file:///C:\DOCUME~1\wangh\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></imagedata></shape></span></span><font face="宋体"><font size="2">，</font><span style="FONT-SIZE: 12pt;">不用矩阵求逆公式，怎样求P</span></font></p>
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