(m*(1-p)+2m*(1+p)) / (m*(1-p)^2+2m*(1+p)^2)
p=10%时: (m*0.9+2m*1.1)/(m*0.81+2m*1.21)=3.1m/3.23m=310/323≈0.96%
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(m*(1-p)+2m*(1+p)) / (m*(1-p)^2+2m*(1+p)^2)
p=10%时: (m*0.9+2m*1.1)/(m*0.81+2m*1.21)=3.1m/3.23m=310/323≈0.96%