求助~~公式化简。

clear
clc
syms v01 v02 va s v1 v2
k = 1000;
r1 = 10,r2 = 680,r3 = 20,r4 = 10,r5 = 20,r6 = 680,r7 = 3.9,r8 = 390;
c = 47;
v01 = (v1/r1 + v2/r3)/(1/r1 + 1/r2 + 1/r3);
v01/r4 + v01/r5 = (va - v01)/r6;
va = -s*c*v2*(r7 + r8)
最后想求得v2,并使结果最简

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