300=(30+2x)x
    0.9*(10^28)=(1/3/(3.1415926^2))*((10.1*2.23*1000/1.0546)^3)*(x^3)
    0.9*10^28 = 1/(3*3.1415926^2)*(10.1*2.23*x/(1.0546*10^(-3)))^3
    0.9*10^(28) = 1/(3*(3.1415926^2))*(10.1*2.23*10^(-31)*x/(1.0546*10^(-34)))^3
    0.9*10^28=1/(3*3.1415926^2)*(10.1*2.23*x/(1.0546*10^(-3)))^3
    6.1 = (1/(3*(3.1415926)^2))*(9.9*x/1.0546)^3
    6.1=(1/(3*(3.1415926)^2))*(9.9*2.23*x/1.0546)^3
    3.86 = (3.1415926/3)^(2/3)*1.38*1.38*x*(0.9)^(1/3)/((1.0564)^2)
    （（80-69）*0.021+2.28）*1.8+0.06+0.28+1.31=x
    7.1=(3.1415926/3)^(2/3)*1.38*1.38*x*(6.1)^(1/3)/((1.0564)^2)
    （25.343+x）×0.85＝50.687+66.83-x
    （25.343+x）×0.85＝50.687+67.83-x
    （25.343+x）×0.85＝50.687+68.83-x
    （25.343+x）×0.85＝50.687+69.83-x
    （25.343+x）×0.85＝50.687+70.83-x
    25+x＝31.409+145.651-x
    25+x＝31.409+145.651-x
    1/(2+z)+2/(1+z)+z/(1+2)=4
    1.05^(n-1)-50.4/52.92=50/52.92
    1.05^(n-1)*52.92-50.4=50

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