matlab >> syms x y z a b cy=16.7143*x^2-46.227*x+36.3129;z=0.273+(0.1338*y)/(100-y);a=((890.939+179.24*x)*(100-y))/23953;f2=z+a;f3=diff(f2,x);f3=0怎么求解 直接用SOLVE(F3)对吗?
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