求matlab代码解方程!x=[2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014];y=[x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12];z=100-100*(y-1)/351p1=polyfit(x,z,1);f=poly2str(p1,'z')k=p1(1)S= A1*a+A2*b+A3*(1+t/100)*ca=1/100*(-20000+200*t)/(100+t
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