(-434854910*x-8873291*(1-x))/(sqrt(58815032*x^2+190701419*(1-x)^2))≥2
    (-434854910*x-8873291*(1-x))/(sqrt(58815032*x^2+190701419*(1-x)^2))≥0
    (-434854910*x-8873291*(1-x))/(sqrt(58815032*x^2+190701419*(1-x)^2))≤2.33
    (-434854910*x-8873291*(1-x))/(sqrt(58815032*x^2+190701419*(1-x)^2))≤-2.33
    a>0.7*(1-a)^2
    (-457*x+(1-x)*40911)/(sqrt(0.0232*x^2+7.783*x^2))≥0
    (-457*x+(1-x)*40911)/(sqrt(0.0232*x^2+7.783*x^2))≤0
    1 - ( 1 - 1 / 27000 ) ^ ( 120 * x ) >= 99.9 %
    (-0.3+101.7*t/100)-t<0.1
    abs((-0.3+101.7*t/100)-t)<0.1
    9x+5<8x+7 (4/3)x+2>1-(2/3)x
    60x+10（400-x）<=10000
    tanx>x
    6x^2+25x+14<=0
    4x^2-29x-24<=0
     ( 2 * x ^ 2 - x + 1 ) / ( 2 * x + 1 ) >0
    （2x^2-x+1）/（2x+1）＞0
    2/x＞-1
    (3x+1)/（2x-1）＜2
    （x+1）/（x-1）≥0

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