用matlab求解一元三次方程lear all;syms k rowl rowg sigma ug ul R m w;rowl=745.1143;rowg=34.7859;sigma=0.072;ug=7;ul=4;R=0.1;m=0.1*R;w=50;s=solve('0.5*k*m*rowg*rowl*(ug-ul)^2-(k*sigma-(rowl-rowg)*w^2*R/k)*(0.5*k*m*rowl+rowg)=0','k');s=simplify

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