(20-x)/(0.2*x^0.2)=39.18
    arctan1/x
    27-6x^x-x^x^x=0
    R²=36
    110.58=R²
    x^2-x-2016=0
    1.5x^2+x-0. 58＝0
    sqrt(3)/(2)=-sqrt(3)/2(1-1/2-2n)^2+(9/8-n)sqrt(3)
    sqrt(3)/(2)=-sqrt(3)/2(1-1/2-2n)^2+(9/8-n)sqrt(3)
    sqrt(3)/(-2)=-sqrt(3)/2(1-1/2-2n)^2+(9/8-n)sqrt(3)
    1/4*3.14*2R*2R
    ((x*x)/0.72)*0.25+2.5*x=(((0.72-x)*(0.72-x))/0.72)*0.25
    x(2x-1)(3x+2)/(x+1)(2x-3)(4x-1)
    -4x^2+13=0
    4-4×（x-2）/x＝1
    （80+2x）（50+2x）＝5400
    （20-2x）（13-2x）＝144
    [(x-600)*75%]/8000=[(x-850)*75%]/7000
    （x-2）（x-3）=12
     [(x-400-2000*10%)*(1-25%)]/(6000+2000) = [(x-400-3000*15%)*(1-25%)]/(6000+1000)

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