四元方程求解,vpasolve函数。

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大佬们帮忙看看这个四元方程为什么解不出来:(图为数学表达式)
eq1=sym('a/(pi/8*(a-b)^3*b+pi/8*(a-2*b-c)^3*c+pi/8*(a-2*b-2*c-0.02)^3*0.02))-645454.5455/(285551.776+50948.722*(1-a/5.8)+74796.986*(1-(a/5.8)^2))==0');
eq2=sym('a/100+0.00635-b==0');
eq3=sym('(a-2*b-((a-2*b)^4-64*d/pi)^0.25)/2-c==0');
eq4=sym('6.087*(4.772-pi/8*(a-b)^3*b-pi/8*(a-2*b-2*c-0.02)^3*0.02)-d==0');
S=vpasolve(eq1,eq2,eq3,eq4);
a=S.a
b=S.b
c=S.c
d=S.d

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