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我想解方程组代码如下:c=300;
r1=20;
syms r2 R1 R2 l
eq1='R1-4*r1=0';
eq2='R2-2*r2=0';
eq3='2*300+1.57*(r1+R1)+(r1-R1)^2/(4*300)=2*300+1.57*(r2+R2)+(r2-R2)^2/(4*300)';
[r2,R1,R2]=solve(eq1,eq2,eq3,'r2,R1,R2')
问题是我知道c和r1,为什么结果还包含c和r1,应当怎么处理
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