x(x+1)+(x+1)=144
    2000(1-x)^2=1280
    0.5x(x-1)=110
    90-arctanx-arctanx/5=57.63
    (32+x)×3-10=(32-x)×4
    5xx-10x+0.1=0
    xx=4
    4x²+5x-15＝0
    5-10*（2.71^-t）+5*（2.71^-2t）=4.9
    x+x^2=30
    1+x+x^2=30
    x(x-1)*0.5=182
    x(x-1)=182
    x/(x-1)-1=3/(x^2-1)
    200(1-x)^2=162
    √(67.24-x^2)+√(134.56-44.89+13.4x-x^2)=√(67.24-44.89+13.4x-x^2)+√(134.56-x^2)
    √(67.24-x^2)+√(134.56-44.89+13.4x-x^2)=√(67.24-44.89+13.4x-x^2)+√(134.56-x^2)
    √(67.24-x^2)+√(134.56-44.89+13.4x-x^2)=√(67.24-44.89+13.4x-x^2
     (1 + r)^3=0.913897
    √(67.24-x^2)+√(134.56-44.89+13.4x-x^2)=√(67.24-44.89+13.4x-x^2)+√(134.56-x^2)

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