x×x+x＝84
    37.6889=100/(1+x)^20
    90.7029 = 100/(1+x)^2
    90.7029 = 100/(1+x)^2
    90.7029=100/(1+x)^2
    95.2381=100/(1+x)^1
    1.6(1+ x)2=2.5
    90.70 = 100/(1+x)^3
    90.70=100/(1+x)^2
    90.70=100/(1+x)+100/(1+x)^2
    95.24=100/(1+x)
    90.70=100/（1+x）
    1728 ：2304=x ：8.5
    1728 ×2304=x ×8.5 x=
    0.198+(0.81x/123.5)+(x-0.1478)^2/545.88^2+(0.8x-0.168)^2/39.9^2=1
    x^3-1
    0.2+(0.81x/123)+(x-0.147)^2/550^2+（0.8x-0.168)^2/39^2=1
    0.2+(0.81x/187)+(x-0.147)^2/550^2+（0.8x-0.168)/155=1
    0.2+(0.81x/187)+(x-0.147)^2/550^2+（0.8x-0.168)/67=1
    0.2+(0.81x/123)+(x-0.147)^2/550^2+（0.8x-0.168)/67=1

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