x^3 - 950x^2 + 267500x + 250725000 = 0
    （18.5）（18.5）+（x-7）（x-7）=ex
    x^2+5500×x+7562500=0
    −120x²+1274x+16875=0
    −120x2+1274x+16875=0
    -90+arctan(0.3*x)-arctan(x)-arctan(0.1*x)=-180
    0.0027=27x^2-5.4x+0.27
    27x^2-5.4x+2.7 = 0.0027
    27^2-5.4x+2.7 = 0.0027
    27x2-5.4x+2.7 = 0.0027
    27x^2-5.4x+2.7 = 0.0027
    27x^2-5.4x+0.27 = 0.0027
    (x-2500)(x-3000)=55000
    （x²-1）^-1
    （x²-1）½
    -90-arctan(x)-arctan(0.1*x)=-180
    X-60% 等于160
    1.12184x/(1.12184-1.0467)+(1-x)/(1-1.0467)=27.77
    (x+6)²-x²=216
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=-180

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