(1-x^9)/(1-x)=87
    302526+2x^2=1176√2x
    √2/2=（x^2+588^2-441^2）/1176x
    -0.003×X×X-0.91×X+98.44=0.0169
    x^3-9*x+1=0
    Lgx=-2.4
    x²-2x+3
    -0.0614×X×X+0.0895×X+1.3304=1.3580
    -0.0614×X×X+0.0895×X+1.3304
    1.4234=0.0184×X×X-0.0831×X+1.4246
    1.361=-0.0614×X×X+0.0895×X+1.3304
    Lgx=-2.4
    1.367=-0.0614×X×X+0.0895×X+1.3304
    1.367=-0.0614×X×X+0.0895×X+1.3304
    1.367=-0.0614×X×X+0.0895×X+1/3304
    0.0169=-0.003×X×X-0.91X+98.44
    0.0193=-0.003×X×X-0.91X+98.44
    1.4323=-0.003×X×X-0.91X+98.44
    1.4323=-0.003×X×X-0.91X+98.44
    1.4323=-0.003×X×X-0.91X+98.44

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