x^2-e^x-4*x
    x^3-14x^2+8x+32=0
    ((sqrt(2+x)-sqrt(x))/(sqrt(1+x)-sqrt(x)))=1.7106127
    ((sqrt(2-x)-sqrt(x))/(sqrt(1-x)-sqrt(x)))=1.7106127
    ((sqrt(2-x)-sqrt(x))/(sqrt(1-x)-sqrt(x)))=1.706127
    18%xX+13%x(1-X)=16%
    (1-x)(0.85*49x-36+36x)=36-36x
    x+5x/10=819
    x+5x/10=1455
    x+5x/10=58
    （x-2000)*10%-25=55.39
    X-953.66-[(x-953.66-5000)*0.03=11640.95
    (X-953.66-5000)*0.03=55.39
    2x^3-3x^2-x+1=0
    i^2
    x^2+1=0
    -19340000+5669500x=770100+267500x
    -19340000+5669500x=770100+267500x
    -19340000+5669500x=770100+267500x
    （23,050-x）/x=24.5%

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