x(1-x^18)/(1-x)=138.4530474
    x(1-x^18)/(1-x)=138.4530474
    x(1-x^18)/(1-x)=138.4530474
    x(1-x^18)/(1-x)=142.7970206
    x(1-x^18)/(1-x)=174.7744075
    x(1-x^18)/(1-x)=123.9671139
    x(1-x^18)/(1-x)=177.5306287
    lgx=0.25
    x(1-x^18)/(1-x)=308.1262826
    x(1-x^18)/(1-x)=96.69678384
    x(1-x^18)/(1-x)=55.39757118
    w^2+0.26w^4+0.0025w^6-1=0
    x∧2/（6－2x）∧2=2.88*0.001
    x(1-x^18)/(1-x)=201.6116953
    x(1-x^18)/(1-x)=108.1274316
    x(1-x^18)/(1-x)=120.017808
    x(1-x^18)/(1-x)=103.0749651
    x(1-x^18)/(1-x)=103.0749651
    x(1-x^18)/(1-x)=103.0749651
    x(1-x^18)/(1-x)=103.0749651

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