1 = -9.4418x2 + 5.6388x + 0.0471
    0.5 = -9.4418x2 + 5.6388x + 0.0471
    0.506 = -9.4418x2 + 5.6388x + 0.0471
    x^2(x+0.75)^3=(1.5-x)^2(2-x)^3
    0.0025x^6+016x^4+x^2-10=0
    25%=（500000-x）/x*100%
    m^2－28m＋192
    1/(x-1)+1/(x+1)=4/(xx-1)
    1/(x-4)+1/x=0
    arctan2x-arctan8x＝-π/2
    （x-20）（540-10x)=2400
    arctan2x-arctan8x＝-90
    a×4+(a+3)×2-(a+3+a)×2=16
    arctan2x+arctan8x＝180-π/2
    a×4+(a+3)×2-(a+3)×2=16
    arctan2x+arctan8x＝180-π/2
    （x-20）（540-10x)=2400
    6a+6-(2a+6)=16
    arctan2x+arctan8x＝180
    （x+6）20=(x+6+x)12

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