3x^2－2x+3
    -x^2+x-1/3*lg(x+1/3)/lg(e)-2/3*lg(1/3)/lg(e)
    2*(x-180)=3*(x-500)
    5*(x-740)=4*(x-300)
    x^2+x-0.5= 0
    2x^2+x-1= 0
    2x^2+x-0.618= 0
    x^2+x-1= 0
    1.5x^2+x-0. 549＝0
    6*(x-850)=7*(x-1200)
    3*(x-600)=4*(x-1200)
    7*(x-600)=8*(x-850)
    2025*22%=X*（610-X）*26%
    x^(x^-1)
    10*x-2000=11*x-11*350
    x*0.59*1.85*1.3=2.45
    [(x-850)*75%]/7000=[(x-1200)*75%]/6000
    20/x-1=(2/x)^0.2*(2/x-1)
    20/x-1=((2/x)^0.2)*(2/x-1)
    (8.09-x)/(0.2*x^0.2)=39.18

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